Update html-webpack-plugin to the latest version 🚀 (#183)

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "extract-text-webpack-plugin": "^3.0.1",
     "hard-source-webpack-plugin": "^0.5.14",
     "history": "^4.7.2",
-    "html-webpack-plugin": "^2.30.1",
+    "html-webpack-plugin": "^3.0.0",
     "jsonwebtoken": "^8.1.0",
     "material-ui": "^1.0.0-beta.29",
     "material-ui-icons": "^1.0.0-beta.17",