Bump html-webpack-plugin from 2.30.1 to 3.2.0

Bumps [html-webpack-plugin](https://github.com/jantimon/html-webpack-plugin) from 2.30.1 to 3.2.0.
- [Release notes](https://github.com/jantimon/html-webpack-plugin/releases)
- [Changelog](https://github.com/jantimon/html-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jantimon/html-webpack-plugin/compare/v2.30.1...v3.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -102,7 +102,7 @@
     "eslint-plugin-standard": "^3.0.1",
     "extract-text-webpack-plugin": "^3.0.0",
     "file-loader": "^0.11.2",
-    "html-webpack-plugin": "^2.30.1",
+    "html-webpack-plugin": "^3.2.0",
     "inject-loader": "^4.0.1",
     "karma": "^1.3.0",
     "karma-chai": "^0.1.0",