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

Closes #273

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "eslint-config-posva": "^1.3.1",
     "extract-text-webpack-plugin": "^3.0.0",
     "function-bind": "^1.1.1",
-    "html-webpack-plugin": "^2.30.1",
+    "html-webpack-plugin": "^3.0.4",
     "in-publish": "^2.0.0",
     "karma": "^1.7.1",
     "karma-chai-dom": "^1.1.0",