Bump html-webpack-plugin from 3.2.0 to 4.2.0

Bumps [html-webpack-plugin](https://github.com/jantimon/html-webpack-plugin) from 3.2.0 to 4.2.0.
- [Release notes](https://github.com/jantimon/html-webpack-plugin/releases)
- [Changelog](https://github.com/jantimon/html-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](jantimon/html-webpack-plugin@v3.2.0...v4.2.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

packages/playground/package.json

@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "babel-loader": "^8.1.0",
-    "html-webpack-plugin": "^3.2.0",
+    "html-webpack-plugin": "^4.2.0",
     "webpack": "^4.42.1",
     "webpack-cli": "^3.3.11",
     "webpack-dev-server": "^3.10.3"