Merge pull request #28 from PolymerX/greenkeeper/parse5-4.0.0

Update parse5 to the latest version 🚀

Author: LasaleFamine

package.json

@@ -54,7 +54,7 @@
   "dependencies": {
     "fs-extra": "4.0.3",
     "loader-utils": "1.1.0",
-    "parse5": "3.0.3",
+    "parse5": "4.0.0",
     "postcss": "6.0.15",
     "postcss-load-config": "1.2.0"
   },