diff --git a/.gitignore b/.gitignore
index f879d83..3190c66 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /vendor
+/composer.lock
 /.idea
 /build
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index 14f61cc..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,2092 +0,0 @@
-{
-    "_readme": [
-        "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
-        "This file is @generated automatically"
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-    "content-hash": "559884a1f47c9fe371a7595604a419ac",
-    "packages": [
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-            "name": "box/spout",
-            "version": "v2.7.3",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/box/spout.git",
-                "reference": "3681a3421a868ab9a65da156c554f756541f452b"
-            },
-            "dist": {
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-                "reference": "3681a3421a868ab9a65da156c554f756541f452b",
-                "shasum": ""
-            },
-            "require": {
-                "ext-xmlreader": "*",
-                "ext-zip": "*",
-                "php": ">=5.4.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.8.0"
-            },
-            "suggest": {
-                "ext-iconv": "To handle non UTF-8 CSV files (if \"php-intl\" is not already installed or is too limited)",
-                "ext-intl": "To handle non UTF-8 CSV files (if \"iconv\" is not already installed)"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.8.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Box\\Spout\\": "src/Spout"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "Apache-2.0"
-            ],
-            "authors": [
-                {
-                    "name": "Adrien Loison",
-                    "email": "adrien@box.com"
-                }
-            ],
-            "description": "PHP Library to read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way",
-            "homepage": "https://www.github.com/box/spout",
-            "keywords": [
-                "OOXML",
-                "csv",
-                "excel",
-                "memory",
-                "odf",
-                "ods",
-                "office",
-                "open",
-                "php",
-                "read",
-                "scale",
-                "spreadsheet",
-                "stream",
-                "write",
-                "xlsx"
-            ],
-            "time": "2017-09-25T19:44:35+00:00"
-        },
-        {
-            "name": "doctrine/inflector",
-            "version": "v1.3.0",
-            "source": {
-                "type": "git",
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-                "reference": "5527a48b7313d15261292c149e55e26eae771b0a",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.1"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^6.2"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Doctrine\\Common\\Inflector\\": "lib/Doctrine/Common/Inflector"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Roman Borschel",
-                    "email": "roman@code-factory.org"
-                },
-                {
-                    "name": "Benjamin Eberlei",
-                    "email": "kontakt@beberlei.de"
-                },
-                {
-                    "name": "Guilherme Blanco",
-                    "email": "guilhermeblanco@gmail.com"
-                },
-                {
-                    "name": "Jonathan Wage",
-                    "email": "jonwage@gmail.com"
-                },
-                {
-                    "name": "Johannes Schmitt",
-                    "email": "schmittjoh@gmail.com"
-                }
-            ],
-            "description": "Common String Manipulations with regard to casing and singular/plural rules.",
-            "homepage": "http://www.doctrine-project.org",
-            "keywords": [
-                "inflection",
-                "pluralize",
-                "singularize",
-                "string"
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-            "time": "2018-01-09T20:05:19+00:00"
-        },
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-            "version": "v5.6.15",
-            "source": {
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-            "dist": {
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-                "shasum": ""
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-            "type": "library",
-            "extra": {
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-            "authors": [
-                {
-                    "name": "Taylor Otwell",
-                    "email": "taylor@laravel.com"
-                }
-            ],
-            "description": "The Illuminate Container package.",
-            "homepage": "https://laravel.com",
-            "time": "2018-01-21T02:13:38+00:00"
-        },
-        {
-            "name": "illuminate/contracts",
-            "version": "v5.6.15",
-            "source": {
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-                "url": "https://github.com/illuminate/contracts.git",
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-                "psr/container": "~1.0",
-                "psr/simple-cache": "~1.0"
-            },
-            "type": "library",
-            "extra": {
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-            "authors": [
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-                    "email": "taylor@laravel.com"
-                }
-            ],
-            "description": "The Illuminate Contracts package.",
-            "homepage": "https://laravel.com",
-            "time": "2018-03-25T12:54:46+00:00"
-        },
-        {
-            "name": "illuminate/database",
-            "version": "v5.6.15",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/illuminate/database.git",
-                "reference": "56c2ab0b8a2f75764082d9087d43d2a3d46c59b0"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/illuminate/database/zipball/56c2ab0b8a2f75764082d9087d43d2a3d46c59b0",
-                "reference": "56c2ab0b8a2f75764082d9087d43d2a3d46c59b0",
-                "shasum": ""
-            },
-            "require": {
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-                "illuminate/contracts": "5.6.*",
-                "illuminate/support": "5.6.*",
-                "php": "^7.1.3"
-            },
-            "suggest": {
-                "doctrine/dbal": "Required to rename columns and drop SQLite columns (~2.6).",
-                "fzaninotto/faker": "Required to use the eloquent factory builder (~1.4).",
-                "illuminate/console": "Required to use the database commands (5.6.*).",
-                "illuminate/events": "Required to use the observers with Eloquent (5.6.*).",
-                "illuminate/filesystem": "Required to use the migrations (5.6.*).",
-                "illuminate/pagination": "Required to paginate the result set (5.6.*)."
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "5.6-dev"
-                }
-            },
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-                    "Illuminate\\Database\\": ""
-                }
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
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-                    "email": "taylor@laravel.com"
-                }
-            ],
-            "description": "The Illuminate Database package.",
-            "homepage": "https://laravel.com",
-            "keywords": [
-                "database",
-                "laravel",
-                "orm",
-                "sql"
-            ],
-            "time": "2018-03-30T13:11:54+00:00"
-        },
-        {
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-            "version": "v5.6.15",
-            "source": {
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-                "reference": "79d074f5a49fa972b3c0ccf4468be2ad92eb3e3d"
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-            },
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-                "nesbot/carbon": "^1.24.1",
-                "php": "^7.1.3"
-            },
-            "conflict": {
-                "tightenco/collect": "<5.5.33"
-            },
-            "suggest": {
-                "illuminate/filesystem": "Required to use the composer class (5.6.*).",
-                "symfony/process": "Required to use the composer class (~4.0).",
-                "symfony/var-dumper": "Required to use the dd function (~4.0)."
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "5.6-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
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-                },
-                "files": [
-                    "helpers.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Taylor Otwell",
-                    "email": "taylor@laravel.com"
-                }
-            ],
-            "description": "The Illuminate Support package.",
-            "homepage": "https://laravel.com",
-            "time": "2018-03-29T15:55:16+00:00"
-        },
-        {
-            "name": "nesbot/carbon",
-            "version": "1.25.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/briannesbitt/Carbon.git",
-                "reference": "cbcf13da0b531767e39eb86e9687f5deba9857b4"
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-                "url": "https://api.github.com/repos/briannesbitt/Carbon/zipball/cbcf13da0b531767e39eb86e9687f5deba9857b4",
-                "reference": "cbcf13da0b531767e39eb86e9687f5deba9857b4",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.9",
-                "symfony/translation": "~2.6 || ~3.0 || ~4.0"
-            },
-            "require-dev": {
-                "friendsofphp/php-cs-fixer": "~2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.23-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Carbon\\": "src/Carbon/"
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            ],
-            "authors": [
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-                    "name": "Brian Nesbitt",
-                    "email": "brian@nesbot.com",
-                    "homepage": "http://nesbot.com"
-                }
-            ],
-            "description": "A simple API extension for DateTime.",
-            "homepage": "http://carbon.nesbot.com",
-            "keywords": [
-                "date",
-                "datetime",
-                "time"
-            ],
-            "time": "2018-03-19T15:50:49+00:00"
-        },
-        {
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-            "version": "1.0.0",
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-            "autoload": {
-                "psr-4": {
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-            "notification-url": "https://packagist.org/downloads/",
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-            "authors": [
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-                    "homepage": "http://www.php-fig.org/"
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-            ],
-            "description": "Common Container Interface (PHP FIG PSR-11)",
-            "homepage": "https://github.com/php-fig/container",
-            "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
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-                "psr"
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-        {
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-            "version": "1.0.1",
-            "source": {
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-            "authors": [
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-            "description": "Common interfaces for simple caching",
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-                "cache",
-                "caching",
-                "psr",
-                "psr-16",
-                "simple-cache"
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-            "time": "2017-10-23T01:57:42+00:00"
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-        {
-            "name": "symfony/polyfill-mbstring",
-            "version": "v1.7.0",
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-                "shasum": ""
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-            "require": {
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "ext-mbstring": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.7-dev"
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-            },
-            "autoload": {
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            "authors": [
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-            "description": "Symfony polyfill for the Mbstring extension",
-            "homepage": "https://symfony.com",
-            "keywords": [
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-                "polyfill",
-                "portable",
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-            "version": "v4.0.7",
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-            "dist": {
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-                "symfony/yaml": "~3.4|~4.0"
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-            "suggest": {
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-                "symfony/yaml": ""
-            },
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
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-            "authors": [
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-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
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-            "description": "Symfony Translation Component",
-            "homepage": "https://symfony.com",
-            "time": "2018-02-22T10:50:29+00:00"
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-    ],
-    "packages-dev": [
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