diff --git a/package-lock.json b/package-lock.json
index 6045525..64aa85a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,15 +4,69 @@
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-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
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-        "fast-deep-equal": "^1.0.0",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.3.0"
+        "detect-libc": "^2.0.0",
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+        "npmlog": "^5.0.1",
+        "rimraf": "^3.0.2",
+        "semver": "^7.3.5",
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+      "optional": true,
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+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-2.0.0.tgz",
+      "integrity": "sha512-lYe4Gx7QT+MKGbDsA+Z+he/Wtef0BiwDOlK/XkBrdfsh9J/jPPXbX0tE9x9cl27Tmu5gg3QUbUrQYa/y+KOHPQ==",
+      "optional": true
+    },
+    "are-we-there-yet": {
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+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-2.0.0.tgz",
+      "integrity": "sha512-Ci/qENmwHnsYo9xKIcUJN5LeDKdJ6R1Z1j9V/J5wyq8nh/mYPEpIKJbBZXtZjG04HiK7zV/p6Vs9952MrMeUIw==",
+      "optional": true,
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@@ -34,11 +88,6 @@
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@@ -48,16 +97,40 @@
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-      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
-      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
+    "canvas": {
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+      "resolved": "https://registry.npmjs.org/canvas/-/canvas-2.11.0.tgz",
+      "integrity": "sha512-bdTjFexjKJEwtIo0oRx8eD4G2yWoUOXP9lj279jmQ2zMnTQhT8C3512OKz3s+ZOaQlLbE7TuVvRDYDB3Llyy5g==",
+      "optional": true,
+      "requires": {
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+        "nan": "^2.17.0",
+        "simple-get": "^3.0.3"
+      }
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+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-2.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
+      "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
+      "optional": true
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       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
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+    "console-control-strings": {
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+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha512-ty/fTekppD2fIwRvnZAVdeOiGd1c7YXEixbgJTNzqcxJWKQnjJ/V1bNEEE6hygpM3WjwHFUVK6HTjWSzV4a8sQ==",
+      "optional": true
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@@ -66,6 +139,36 @@
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+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+      "optional": true,
+      "requires": {
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+    "decompress-response": {
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+      "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-4.2.1.tgz",
+      "integrity": "sha512-jOSne2qbyE+/r8G1VU+G/82LBs2Fs4LAsTiLSHOCOMZQl2OKZ6i8i4IyHemTe+/yIXOtTcRQMzPcgyhoFlqPkw==",
+      "optional": true,
+      "requires": {
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+      }
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+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha512-bd2L678uiWATM6m5Z1VzNCErI3jiGzt6HGY8OVICs40JQq/HALfbyNJmp0UDakEY4pMMaN0Ly5om/B1VI/+xfQ==",
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+    "detect-libc": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.0.1.tgz",
+      "integrity": "sha512-463v3ZeIrcWtdgIg6vI6XUncguvr2TnGl4SzDXinkt9mSLpBJKXT3mW6xT3VQdDN11+WVs29pgvivTc4Lp8v+w==",
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@@ -77,6 +180,12 @@
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+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
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@@ -147,15 +256,25 @@
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-      "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I="
+    "fs-minipass": {
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+      "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-2.1.0.tgz",
+      "integrity": "sha512-V/JgOLFCS+R6Vcq0slCuaeWEdNC3ouDlJMNIsacH2VtALiu9mV4LPrHc5cDl8k5aw6J8jwgWWpiTo5RYhmIzvg==",
+      "optional": true,
+      "requires": {
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+      },
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+          "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.6.tgz",
+          "integrity": "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==",
+          "optional": true,
+          "requires": {
+            "yallist": "^4.0.0"
+          }
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@@ -178,6 +297,23 @@
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       "integrity": "sha1-kCBMPi/appQbso0WZF1BgGOpDps="
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+    "gauge": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/gauge/-/gauge-3.0.2.tgz",
+      "integrity": "sha512-+5J6MS/5XksCuXq++uFRsnUd7Ovu1XenbeuIuNRJxYWjgQbPuFhT14lAvsWfqfAmnwluf1OwMjz39HjfLPci0Q==",
+      "optional": true,
+      "requires": {
+        "aproba": "^1.0.3 || ^2.0.0",
+        "color-support": "^1.1.2",
+        "console-control-strings": "^1.0.0",
+        "has-unicode": "^2.0.1",
+        "object-assign": "^4.1.1",
+        "signal-exit": "^3.0.0",
+        "string-width": "^4.2.3",
+        "strip-ansi": "^6.0.1",
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       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.4.tgz",
@@ -199,6 +335,22 @@
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+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
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+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
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+      "optional": true,
+      "requires": {
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+        "debug": "4"
+      }
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@@ -213,45 +365,53 @@
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-      "integrity": "sha1-NJptRMU6Ud6JtAgFxdXlm0F9M0A="
+    "loophole": {
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+      "resolved": "https://registry.npmjs.org/loophole/-/loophole-1.1.0.tgz",
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+      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-3.1.0.tgz",
+      "integrity": "sha512-g3FeP20LNwhALb/6Cz6Dd4F2ngze0jz7tbzrD2wAV+o9FeNHe4rL+yK2md0J/fiSf1sa1ADhXqi5+oVwOM/eGw==",
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-        "emojis-list": "^3.0.0",
-        "json5": "^1.0.1"
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+        "semver": {
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+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
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-    "loophole": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/loophole/-/loophole-1.1.0.tgz",
-      "integrity": "sha1-N5Sf6kU7YlasxyXDIM4MWn9wor0="
+    "mimic-response": {
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+      "resolved": "https://registry.npmjs.org/mimic-response/-/mimic-response-2.1.0.tgz",
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+      "optional": true
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@@ -266,6 +426,36 @@
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+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-4.0.0.tgz",
+      "integrity": "sha512-g2Uuh2jEKoht+zvO6vJqXmYpflPqzRBT+Th2h01DKh5z7wbY/AZ2gCQ78cP70YoHPyFdY30YBV5WxgLOEwOykw==",
+      "optional": true,
+      "requires": {
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+      }
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+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-2.1.2.tgz",
+      "integrity": "sha512-bAxsR8BVfj60DWXHE3u30oHzfl4G7khkSuPW+qvpd7jFRHm7dLxOjUk1EHACJ/hxLY8phGJ0YhYHZo7jil7Qdg==",
+      "optional": true,
+      "requires": {
+        "minipass": "^3.0.0",
+        "yallist": "^4.0.0"
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+          "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.6.tgz",
+          "integrity": "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==",
+          "optional": true,
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@@ -279,6 +469,18 @@
         "minimist": "^1.2.6"
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+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+      "optional": true
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+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.17.0.tgz",
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@@ -289,6 +491,42 @@
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+      "resolved": "https://registry.npmjs.org/nopt/-/nopt-5.0.0.tgz",
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+        "console-control-strings": "^1.1.0",
+        "gauge": "^3.0.0",
+        "set-blocking": "^2.0.0"
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+      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
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       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -303,12 +541,12 @@
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-      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-1.9.426.tgz",
-      "integrity": "sha1-IOsP1WzP0Q+6BTsgHgI3WuDBccQ=",
+      "version": "3.1.81",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-3.1.81.tgz",
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       "requires": {
-        "node-ensure": "^0.0.0",
-        "worker-loader": "^0.8.0"
+        "canvas": "^2.10.2",
+        "web-streams-polyfill": "^3.2.1"
       }
     },
     "property-accessors": {
@@ -320,6 +558,17 @@
         "mixto": "1.x"
       }
     },
+    "readable-stream": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+      "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
+      "optional": true,
+      "requires": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
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       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
@@ -328,12 +577,48 @@
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-      "integrity": "sha1-9YdyIs4+kx7a4DnxfrNxbnE3+M8=",
+    "safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "optional": true
+    },
+    "semver": {
+      "version": "7.3.8",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.8.tgz",
+      "integrity": "sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==",
+      "optional": true,
+      "requires": {
+        "lru-cache": "^6.0.0"
+      }
+    },
+    "set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
+      "optional": true
+    },
+    "signal-exit": {
+      "version": "3.0.7",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
+      "integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
+      "optional": true
+    },
+    "simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "optional": true
+    },
+    "simple-get": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-3.1.1.tgz",
+      "integrity": "sha512-CQ5LTKGfCpvE1K0n2us+kuMPbk/q0EKl82s4aheV9oXjFEz6W/Y7oQFVJuU6QG77hRT4Ghb5RURteF5vnWjupA==",
+      "optional": true,
       "requires": {
-        "ajv": "^5.0.0"
+        "decompress-response": "^4.2.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
       }
     },
     "space-pen": {
@@ -346,6 +631,63 @@
         "underscore-plus": "1.x"
       }
     },
+    "string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "optional": true,
+      "requires": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      }
+    },
+    "string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "optional": true,
+      "requires": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "optional": true,
+      "requires": {
+        "ansi-regex": "^5.0.1"
+      }
+    },
+    "tar": {
+      "version": "6.1.13",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-6.1.13.tgz",
+      "integrity": "sha512-jdIBIN6LTIe2jqzay/2vtYLlBHa3JF42ot3h1dW8Q0PaAG4v8rm0cvpVePtau5C6OKXGGcgO9q2AMNSWxiLqKw==",
+      "optional": true,
+      "requires": {
+        "chownr": "^2.0.0",
+        "fs-minipass": "^2.0.0",
+        "minipass": "^4.0.0",
+        "minizlib": "^2.1.1",
+        "mkdirp": "^1.0.3",
+        "yallist": "^4.0.0"
+      },
+      "dependencies": {
+        "mkdirp": {
+          "version": "1.0.4",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
+          "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==",
+          "optional": true
+        }
+      }
+    },
+    "tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
+      "optional": true
+    },
     "type": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/type/-/type-1.0.3.tgz",
@@ -364,19 +706,52 @@
         "underscore": "^1.9.1"
       }
     },
-    "worker-loader": {
-      "version": "0.8.1",
-      "resolved": "https://registry.npmjs.org/worker-loader/-/worker-loader-0.8.1.tgz",
-      "integrity": "sha1-6OmVMx6jTfW/aCloJL+38K1XjUM=",
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "optional": true
+    },
+    "web-streams-polyfill": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
+      "integrity": "sha512-e0MO3wdXWKrLbL0DgGnUV7WHVuw9OUvL4hjgnPkIeEvESk74gAITi5G606JtZPp39cd8HA9VQzCIvA49LpPN5Q=="
+    },
+    "webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
+      "optional": true
+    },
+    "whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "optional": true,
       "requires": {
-        "loader-utils": "^1.0.2",
-        "schema-utils": "^0.3.0"
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
+    "wide-align": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
+      "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==",
+      "optional": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2 || 3 || 4"
       }
     },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "optional": true
     }
   }
 }
diff --git a/package.json b/package.json
index 1ed5d11..1f49a6b 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "fs-plus": "2.x",
-    "pdfjs-dist": "1.9.426",
+    "pdfjs-dist": "3.1.81",
     "loophole": "1.1.0",
     "node-ensure": "0.0.0",
     "underscore-plus": "^1.6",