chore(package): update html-webpack-plugin to version 3.0.4

Closes #283

Author: greenkeeper[bot]

package.json

@@ -93,7 +93,7 @@
     "eslint-plugin-prettier": "^2.6.0",
     "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-standard": "^3.0.1",
-    "html-webpack-plugin": "^2.30.1",
+    "html-webpack-plugin": "^3.0.4",
     "husky": "^0.15.0-rc.8",
     "lodash.uniqueid": "^4.0.1",
     "mobx": "^3.5.1",