build(composer): Update youtube-dl to 2018.03.20

See #158

composer.json

@@ -23,7 +23,7 @@
     "phpunit/phpunit": "~6.5.2",
     "doctrine/instantiator": "~1.0.0",
     "ffmpeg/ffmpeg": "~3.4.1",
-    "rg3/youtube-dl": "2018.03.14",
+    "rg3/youtube-dl": "2018.03.20",
     "heroku/heroku-buildpack-php": "*",
     "anam/phantomjs-linux-x86-binary": "~2.1.1"
   },
@@ -39,10 +39,10 @@
       "type": "package",
       "package": {
         "name": "rg3/youtube-dl",
-        "version": "2018.03.14",
+        "version": "2018.03.20",
         "dist": {
           "type": "zip",
-          "url": "https://github.com/rg3/youtube-dl/archive/2018.03.14.zip"
+          "url": "https://github.com/rg3/youtube-dl/archive/2018.03.20.zip"
         }
       }
     },

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": "9e8d724947f22c45b9e9885e567860bc",
+    "content-hash": "9609172b4f93eda8b344d78f57053dc5",
     "packages": [
         {
             "name": "aura/session",
@@ -2159,10 +2159,10 @@
         },
         {
             "name": "rg3/youtube-dl",
-            "version": "2018.03.14",
+            "version": "2018.03.20",
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/rg3/youtube-dl/archive/2018.03.14.zip",
+                "url": "https://github.com/rg3/youtube-dl/archive/2018.03.20.zip",
                 "reference": null,
                 "shasum": null
             },