build(composer): Install phantomjs with composer

#146

composer.json

@@ -22,9 +22,10 @@
     "squizlabs/php_codesniffer": "~3.2.2",
     "phpunit/phpunit": "~6.5.2",
     "doctrine/instantiator": "~1.0.0",
-    "ffmpeg/ffmpeg": "3.4.1",
+    "ffmpeg/ffmpeg": "~3.4.1",
     "rg3/youtube-dl": "2017.12.10",
-    "heroku/heroku-buildpack-php": "*"
+    "heroku/heroku-buildpack-php": "*",
+    "anam/phantomjs-linux-x86-binary": "~2.1.1"
   },
   "extra": {
     "paas": {

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "f9b0a5cf05f0e39a11f132701b9a95b4",
+    "content-hash": "9ba64783ab353b1a590a744bb06065b0",
     "packages": [
         {
             "name": "aura/session",
@@ -1287,6 +1287,48 @@
         }
     ],
     "packages-dev": [
+        {
+            "name": "anam/phantomjs-linux-x86-binary",
+            "version": "v2.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/anam-hossain/phantomjs-linux-x86-binary.git",
+                "reference": "cb90cd0e7bd4ad34f52e6834783b1c5adae15014"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/anam-hossain/phantomjs-linux-x86-binary/zipball/cb90cd0e7bd4ad34f52e6834783b1c5adae15014",
+                "reference": "cb90cd0e7bd4ad34f52e6834783b1c5adae15014",
+                "shasum": ""
+            },
+            "bin": [
+                "bin/phantomjs"
+            ],
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Anam\\PhantomLinux\\": "/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-2-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Anam hossain",
+                    "email": "enam33@gmail.com"
+                }
+            ],
+            "description": "PhantomJS static linked binary for 64 bit linux systems. Most of Linux distributions are supported including Ubuntu, Debian, Fedora and CentOS.",
+            "homepage": "http://phantomjs.org/download.html",
+            "keywords": [
+                "binary",
+                "phantomjs",
+                "phantomjs binary"
+            ],
+            "time": "2016-04-05T05:24:48+00:00"
+        },
         {
             "name": "doctrine/instantiator",
             "version": "1.0.5",