chore(deps): update dependency html-webpack-plugin to v4

Author: renovate-bot

package.json

@@ -31,7 +31,7 @@
     "file-loader": "^1.1.6",
     "gh-release": "^3.4.0",
     "gotrue-js": "^0.9.21",
-    "html-webpack-plugin": "^2.28.0",
+    "html-webpack-plugin": "^4.0.0",
     "json-loader": "^0.5.4",
     "mkdirp": "^0.5.1",
     "mobx": "^3.2.2",