Add URL polyfill

package.json

@@ -11,12 +11,12 @@
         "babel-core": "^6.26.3",
         "babel-eslint": "^8.2.3",
         "babel-plugin-external-helpers": "^6.22.0",
-        "babel-preset-env": "^1.6.1",
+        "babel-preset-env": "^1.7.0",
         "del": "^3.0.0",
         "eslint": "^4.19.1",
         "eslint-config-airbnb-base": "^12.1.0",
         "eslint-config-prettier": "^2.9.0",
-        "eslint-plugin-import": "^2.11.0",
+        "eslint-plugin-import": "^2.12.0",
         "git-branch": "^2.0.1",
         "gulp": "^3.9.1",
         "gulp-autoprefixer": "^5.0.0",
@@ -26,23 +26,25 @@
         "gulp-filter": "^5.1.0",
         "gulp-header": "^2.0.5",
         "gulp-open": "^3.0.1",
-        "gulp-rename": "^1.2.2",
-        "gulp-replace": "^0.6.1",
+        "gulp-postcss": "^7.0.1",
+        "gulp-rename": "^1.2.3",
+        "gulp-replace": "^1.0.0",
         "gulp-s3": "^0.11.0",
         "gulp-sass": "^4.0.1",
         "gulp-size": "^3.0.0",
         "gulp-sourcemaps": "^2.6.4",
         "gulp-svgmin": "^1.2.4",
         "gulp-svgstore": "^6.1.1",
-        "gulp-uglify-es": "^1.0.1",
+        "gulp-uglify-es": "^1.0.4",
         "gulp-util": "^3.0.8",
+        "postcss-custom-properties": "^7.0.0",
         "prettier-eslint": "^8.8.1",
         "prettier-stylelint": "^0.4.2",
         "rollup-plugin-babel": "^3.0.4",
         "rollup-plugin-commonjs": "^9.1.3",
         "rollup-plugin-node-resolve": "^3.3.0",
         "run-sequence": "^2.2.1",
-        "stylelint": "^9.2.0",
+        "stylelint": "^9.2.1",
         "stylelint-config-prettier": "^3.2.0",
         "stylelint-config-recommended": "^2.1.0",
         "stylelint-config-sass-guidelines": "^5.0.0",
@@ -50,7 +52,15 @@
         "stylelint-scss": "^3.1.0",
         "stylelint-selector-bem-pattern": "^2.0.0"
     },
-    "keywords": ["HTML5 Video", "HTML5 Audio", "Media Player", "DASH", "Shaka", "WordPress", "HLS"],
+    "keywords": [
+        "HTML5 Video",
+        "HTML5 Audio",
+        "Media Player",
+        "DASH",
+        "Shaka",
+        "WordPress",
+        "HLS"
+    ],
     "repository": {
         "type": "git",
         "url": "git://github.com/sampotts/plyr.git"
@@ -70,7 +80,7 @@
         "babel-polyfill": "^6.26.0",
         "custom-event-polyfill": "^0.3.0",
         "loadjs": "^3.5.4",
-        "npm": "^6.0.0",
-        "raven-js": "^3.24.2"
+        "raven-js": "^3.25.2",
+        "url-polyfill": "^1.0.13"
     }
 }

src/js/plyr.polyfilled.js

@@ -7,6 +7,7 @@
 
 import 'babel-polyfill';
 import 'custom-event-polyfill';
+import 'url-polyfill';
 import Plyr from './plyr';
 
 export default Plyr;