diff --git a/composer.lock b/composer.lock
index 384fdcd..b4bd7fe 100644
--- a/composer.lock
+++ b/composer.lock
@@ -93,6 +93,10 @@
                 "MIT"
             ],
             "description": "implementation of xdg base directory specification for php",
+            "support": {
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+                "source": "https://github.com/dnoegel/php-xdg-base-dir/tree/master"
+            },
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         },
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@@ -448,6 +452,60 @@
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             "time": "2019-03-17T18:48:37+00:00"
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+                "url": "https://github.com/ezyang/htmlpurifier.git",
+                "reference": "08e27c97e4c6ed02f37c5b2b20488046c8d90d75"
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.2"
+            },
+            "require-dev": {
+                "simpletest/simpletest": "dev-master#72de02a7b80c6bb8864ef9bf66d41d2f58f826bd"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "HTMLPurifier": "library/"
+                },
+                "files": [
+                    "library/HTMLPurifier.composer.php"
+                ],
+                "exclude-from-classmap": [
+                    "/library/HTMLPurifier/Language/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-2.1-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Edward Z. Yang",
+                    "email": "admin@htmlpurifier.org",
+                    "homepage": "http://ezyang.com"
+                }
+            ],
+            "description": "Standards compliant HTML filter written in PHP",
+            "homepage": "http://htmlpurifier.org/",
+            "keywords": [
+                "html"
+            ],
+            "support": {
+                "issues": "https://github.com/ezyang/htmlpurifier/issues",
+                "source": "https://github.com/ezyang/htmlpurifier/tree/master"
+            },
+            "time": "2020-06-29T00:56:53+00:00"
+        },
         {
             "name": "fideloper/proxy",
             "version": "4.2.1",
@@ -1006,32 +1064,103 @@
             ],
             "time": "2019-09-04T19:28:20+00:00"
         },
+        {
+            "name": "maennchen/zipstream-php",
+            "version": "2.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/maennchen/ZipStream-PHP.git",
+                "reference": "c4c5803cc1f93df3d2448478ef79394a5981cc58"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/maennchen/ZipStream-PHP/zipball/c4c5803cc1f93df3d2448478ef79394a5981cc58",
+                "reference": "c4c5803cc1f93df3d2448478ef79394a5981cc58",
+                "shasum": ""
+            },
+            "require": {
+                "myclabs/php-enum": "^1.5",
+                "php": ">= 7.1",
+                "psr/http-message": "^1.0",
+                "symfony/polyfill-mbstring": "^1.0"
+            },
+            "require-dev": {
+                "ext-zip": "*",
+                "guzzlehttp/guzzle": ">= 6.3",
+                "mikey179/vfsstream": "^1.6",
+                "phpunit/phpunit": ">= 7.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "ZipStream\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Paul Duncan",
+                    "email": "pabs@pablotron.org"
+                },
+                {
+                    "name": "Jonatan Männchen",
+                    "email": "jonatan@maennchen.ch"
+                },
+                {
+                    "name": "Jesse Donat",
+                    "email": "donatj@gmail.com"
+                },
+                {
+                    "name": "András Kolesár",
+                    "email": "kolesar@kolesar.hu"
+                }
+            ],
+            "description": "ZipStream is a library for dynamically streaming dynamic zip files from PHP without writing to the disk at all on the server.",
+            "keywords": [
+                "stream",
+                "zip"
+            ],
+            "support": {
+                "issues": "https://github.com/maennchen/ZipStream-PHP/issues",
+                "source": "https://github.com/maennchen/ZipStream-PHP/tree/master"
+            },
+            "funding": [
+                {
+                    "url": "https://opencollective.com/zipstream",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2020-05-30T13:11:16+00:00"
+        },
         {
             "name": "markbaker/complex",
-            "version": "1.4.7",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/MarkBaker/PHPComplex.git",
-                "reference": "1ea674a8308baf547cbcbd30c5fcd6d301b7c000"
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-                "reference": "1ea674a8308baf547cbcbd30c5fcd6d301b7c000",
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             "require": {
-                "php": "^5.6.0|^7.0.0"
+                "php": "^7.2 || ^8.0"
             },
             "require-dev": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.4.3",
-                "phpcompatibility/php-compatibility": "^8.0",
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
+                "phpcompatibility/php-compatibility": "^9.0",
                 "phpdocumentor/phpdocumentor": "2.*",
-                "phploc/phploc": "2.*",
+                "phploc/phploc": "^4.0",
                 "phpmd/phpmd": "2.*",
-                "phpunit/phpunit": "^4.8.35|^5.4.0",
-                "sebastian/phpcpd": "2.*",
-                "squizlabs/php_codesniffer": "^3.3.0"
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.3",
+                "sebastian/phpcpd": "^4.0",
+                "squizlabs/php_codesniffer": "^3.4"
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@@ -1099,33 +1228,38 @@
                 "complex",
                 "mathematics"
             ],
-            "time": "2018-10-13T23:28:42+00:00"
+            "support": {
+                "issues": "https://github.com/MarkBaker/PHPComplex/issues",
+                "source": "https://github.com/MarkBaker/PHPComplex/tree/PHP8"
+            },
+            "time": "2020-08-26T10:42:07+00:00"
         },
         {
             "name": "markbaker/matrix",
-            "version": "1.2.0",
+            "version": "2.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/MarkBaker/PHPMatrix.git",
-                "reference": "5348c5a67e3b75cd209d70103f916a93b1f1ed21"
+                "reference": "361c0f545c3172ee26c3d596a0aa03f0cef65e6a"
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-                "reference": "5348c5a67e3b75cd209d70103f916a93b1f1ed21",
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             "require": {
-                "php": "^5.6.0|^7.0.0"
+                "php": "^7.1 || ^8.0"
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             "require-dev": {
-                "dealerdirect/phpcodesniffer-composer-installer": "dev-master",
-                "phpcompatibility/php-compatibility": "dev-master",
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-                "phpmd/phpmd": "dev-master",
-                "phpunit/phpunit": "^5.7",
-                "sebastian/phpcpd": "^3.0",
-                "squizlabs/php_codesniffer": "^3.0@dev"
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
+                "phpcompatibility/php-compatibility": "^9.0",
+                "phpdocumentor/phpdocumentor": "2.*",
+                "phploc/phploc": "^4.0",
+                "phpmd/phpmd": "2.*",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.3",
+                "sebastian/phpcpd": "^4.0",
+                "squizlabs/php_codesniffer": "^3.4"
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@@ -1133,22 +1267,22 @@
                     "Matrix\\": "classes/src/"
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-                    "classes/src/functions/antidiagonal.php",
-                    "classes/src/functions/cofactors.php",
-                    "classes/src/functions/determinant.php",
-                    "classes/src/functions/diagonal.php",
-                    "classes/src/functions/identity.php",
-                    "classes/src/functions/inverse.php",
-                    "classes/src/functions/minors.php",
-                    "classes/src/functions/trace.php",
-                    "classes/src/functions/transpose.php",
-                    "classes/src/operations/add.php",
-                    "classes/src/operations/directsum.php",
-                    "classes/src/operations/subtract.php",
-                    "classes/src/operations/multiply.php",
-                    "classes/src/operations/divideby.php",
-                    "classes/src/operations/divideinto.php"
+                    "classes/src/Functions/adjoint.php",
+                    "classes/src/Functions/antidiagonal.php",
+                    "classes/src/Functions/cofactors.php",
+                    "classes/src/Functions/determinant.php",
+                    "classes/src/Functions/diagonal.php",
+                    "classes/src/Functions/identity.php",
+                    "classes/src/Functions/inverse.php",
+                    "classes/src/Functions/minors.php",
+                    "classes/src/Functions/trace.php",
+                    "classes/src/Functions/transpose.php",
+                    "classes/src/Operations/add.php",
+                    "classes/src/Operations/directsum.php",
+                    "classes/src/Operations/subtract.php",
+                    "classes/src/Operations/multiply.php",
+                    "classes/src/Operations/divideby.php",
+                    "classes/src/Operations/divideinto.php"
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             "notification-url": "https://packagist.org/downloads/",
@@ -1158,7 +1292,7 @@
             "authors": [
                 {
                     "name": "Mark Baker",
-                    "email": "mark@lange.demon.co.uk"
+                    "email": "mark@demon-angel.eu"
                 }
             ],
             "description": "PHP Class for working with matrices",
@@ -1168,7 +1302,11 @@
                 "matrix",
                 "vector"
             ],
-            "time": "2019-10-06T11:29:25+00:00"
+            "support": {
+                "issues": "https://github.com/MarkBaker/PHPMatrix/issues",
+                "source": "https://github.com/MarkBaker/PHPMatrix/tree/2.1.2"
+            },
+            "time": "2021-01-23T16:37:31+00:00"
         },
         {
             "name": "monolog/monolog",
@@ -1248,6 +1386,66 @@
             ],
             "time": "2019-09-06T13:49:17+00:00"
         },
+        {
+            "name": "myclabs/php-enum",
+            "version": "1.7.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/php-enum.git",
+                "reference": "d178027d1e679832db9f38248fcc7200647dc2b7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/php-enum/zipball/d178027d1e679832db9f38248fcc7200647dc2b7",
+                "reference": "d178027d1e679832db9f38248fcc7200647dc2b7",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "php": ">=7.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^7",
+                "squizlabs/php_codesniffer": "1.*",
+                "vimeo/psalm": "^3.8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "MyCLabs\\Enum\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP Enum contributors",
+                    "homepage": "https://github.com/myclabs/php-enum/graphs/contributors"
+                }
+            ],
+            "description": "PHP Enum implementation",
+            "homepage": "http://github.com/myclabs/php-enum",
+            "keywords": [
+                "enum"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/php-enum/issues",
+                "source": "https://github.com/myclabs/php-enum/tree/1.7.7"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/mnapoli",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/php-enum",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-14T18:14:52+00:00"
+        },
         {
             "name": "nesbot/carbon",
             "version": "2.25.1",
@@ -1317,16 +1515,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.2.4",
+            "version": "v4.10.5",
             "source": {
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                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "97e59c7a16464196a8b9c77c47df68e4a39a45c4"
+                "reference": "4432ba399e47c66624bc73c8c0f811e5c109576f"
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-                "reference": "97e59c7a16464196a8b9c77c47df68e4a39a45c4",
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@@ -1334,7 +1532,8 @@
                 "php": ">=7.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0"
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
             },
             "bin": [
                 "bin/php-parse"
@@ -1342,7 +1541,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.2-dev"
+                    "dev-master": "4.9-dev"
                 }
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             "autoload": {
@@ -1364,7 +1563,11 @@
                 "parser",
                 "php"
             ],
-            "time": "2019-09-01T07:51:21+00:00"
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.10.5"
+            },
+            "time": "2021-05-03T19:11:20+00:00"
         },
         {
             "name": "opis/closure",
@@ -1470,6 +1673,11 @@
                 "pseudorandom",
                 "random"
             ],
+            "support": {
+                "email": "info@paragonie.com",
+                "issues": "https://github.com/paragonie/random_compat/issues",
+                "source": "https://github.com/paragonie/random_compat"
+            },
             "time": "2018-07-02T15:55:56+00:00"
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         {
@@ -1551,16 +1759,16 @@
         },
         {
             "name": "phpoffice/phpspreadsheet",
-            "version": "1.9.0",
+            "version": "1.17.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPOffice/PhpSpreadsheet.git",
-                "reference": "8dea03eaf60a349b6097e4bcad11f894668280df"
+                "reference": "c55269cb06911575a126dc225a05c0e4626e5fb4"
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-                "reference": "8dea03eaf60a349b6097e4bcad11f894668280df",
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@@ -1577,26 +1785,30 @@
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                 "ext-zlib": "*",
-                "markbaker/complex": "^1.4",
-                "markbaker/matrix": "^1.1",
-                "php": "^7.1",
+                "ezyang/htmlpurifier": "^4.13",
+                "maennchen/zipstream-php": "^2.1",
+                "markbaker/complex": "^1.5||^2.0",
+                "markbaker/matrix": "^1.2||^2.0",
+                "php": "^7.2||^8.0",
+                "psr/http-client": "^1.0",
+                "psr/http-factory": "^1.0",
                 "psr/simple-cache": "^1.0"
             },
             "require-dev": {
-                "dompdf/dompdf": "^0.8.0",
-                "friendsofphp/php-cs-fixer": "@stable",
+                "dompdf/dompdf": "^0.8.5",
+                "friendsofphp/php-cs-fixer": "^2.18",
                 "jpgraph/jpgraph": "^4.0",
-                "mpdf/mpdf": "^7.0.0",
-                "phpcompatibility/php-compatibility": "^8.0",
-                "phpunit/phpunit": "^7.5",
-                "squizlabs/php_codesniffer": "^3.3",
-                "tecnickcom/tcpdf": "^6.2"
+                "mpdf/mpdf": "^8.0",
+                "phpcompatibility/php-compatibility": "^9.3",
+                "phpunit/phpunit": "^8.5||^9.3",
+                "squizlabs/php_codesniffer": "^3.5",
+                "tecnickcom/tcpdf": "^6.3"
             },
             "suggest": {
-                "dompdf/dompdf": "Option for rendering PDF with PDF Writer",
+                "dompdf/dompdf": "Option for rendering PDF with PDF Writer (doesn't yet support PHP8)",
                 "jpgraph/jpgraph": "Option for rendering charts, or including charts with PDF or HTML Writers",
                 "mpdf/mpdf": "Option for rendering PDF with PDF Writer",
-                "tecnickcom/tcpdf": "Option for rendering PDF with PDF Writer"
+                "tecnickcom/tcpdf": "Option for rendering PDF with PDF Writer (doesn't yet support PHP8)"
             },
             "type": "library",
             "autoload": {
@@ -1606,7 +1818,7 @@
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "LGPL-2.1-or-later"
+                "MIT"
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@@ -1640,7 +1852,11 @@
                 "xls",
                 "xlsx"
             ],
-            "time": "2019-08-17T22:24:35+00:00"
+            "support": {
+                "issues": "https://github.com/PHPOffice/PhpSpreadsheet/issues",
+                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/1.17.1"
+            },
+            "time": "2021-03-02T17:54:11+00:00"
         },
         {
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@@ -1694,27 +1910,22 @@
         },
         {
             "name": "psr/container",
-            "version": "1.0.0",
+            "version": "1.1.1",
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                 "type": "git",
                 "url": "https://github.com/php-fig/container.git",
-                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f"
+                "reference": "8622567409010282b7aeebe4bb841fe98b58dcaf"
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-                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f",
+                "url": "https://api.github.com/repos/php-fig/container/zipball/8622567409010282b7aeebe4bb841fe98b58dcaf",
+                "reference": "8622567409010282b7aeebe4bb841fe98b58dcaf",
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             "require": {
-                "php": ">=5.3.0"
+                "php": ">=7.2.0"
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             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Psr\\Container\\": "src/"
@@ -1727,7 +1938,7 @@
             "authors": [
                 {
                     "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
+                    "homepage": "https://www.php-fig.org/"
                 }
             ],
             "description": "Common Container Interface (PHP FIG PSR-11)",
@@ -1739,20 +1950,184 @@
                 "container-interop",
                 "psr"
             ],
-            "time": "2017-02-14T16:28:37+00:00"
+            "support": {
+                "issues": "https://github.com/php-fig/container/issues",
+                "source": "https://github.com/php-fig/container/tree/1.1.1"
+            },
+            "time": "2021-03-05T17:36:06+00:00"
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-            "time": "2019-08-22T18:11:29+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
+                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.4.0"
+            },
+            "time": "2020-09-17T18:55:26+00:00"
         },
         {
             "name": "phpspec/prophecy",
@@ -4862,20 +5617,20 @@
         },
         {
             "name": "sebastian/diff",
-            "version": "3.0.2",
+            "version": "3.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "720fcc7e9b5cf384ea68d9d930d480907a0c1a29"
+                "reference": "14f72dd46eaf2f2293cbe79c93cc0bc43161a211"
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-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/720fcc7e9b5cf384ea68d9d930d480907a0c1a29",
-                "reference": "720fcc7e9b5cf384ea68d9d930d480907a0c1a29",
+                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/14f72dd46eaf2f2293cbe79c93cc0bc43161a211",
+                "reference": "14f72dd46eaf2f2293cbe79c93cc0bc43161a211",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": ">=7.1"
             },
             "require-dev": {
                 "phpunit/phpunit": "^7.5 || ^8.0",
@@ -4897,13 +5652,13 @@
                 "BSD-3-Clause"
             ],
             "authors": [
-                {
-                    "name": "Kore Nordmann",
-                    "email": "mail@kore-nordmann.de"
-                },
                 {
                     "name": "Sebastian Bergmann",
                     "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Kore Nordmann",
+                    "email": "mail@kore-nordmann.de"
                 }
             ],
             "description": "Diff implementation",
@@ -4914,7 +5669,17 @@
                 "unidiff",
                 "unified diff"
             ],
-            "time": "2019-02-04T06:01:07+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/diff/issues",
+                "source": "https://github.com/sebastianbergmann/diff/tree/3.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:59:04+00:00"
         },
         {
             "name": "sebastian/environment",
@@ -5359,29 +6124,33 @@
         },
         {
             "name": "webmozart/assert",
-            "version": "1.5.0",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/88e6d84706d09a236046d686bbea96f07b3a34f4",
-                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/6964c76c7804814a842473e0c8fd15bab0f18e25",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0",
+                "php": "^7.2 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
+            },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+                "phpunit/phpunit": "^8.5.13"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.3-dev"
+                    "dev-master": "1.10-dev"
                 }
             },
             "autoload": {
@@ -5405,7 +6174,11 @@
                 "check",
                 "validate"
             ],
-            "time": "2019-08-24T08:43:50+00:00"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
+            },
+            "time": "2021-03-09T10:59:23+00:00"
         }
     ],
     "aliases": [],
@@ -5416,5 +6189,6 @@
     "platform": {
         "php": "^7.1.3"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
 }