Bump html-webpack-plugin from 3.2.0 to 4.0.3

Bumps [html-webpack-plugin](https://github.com/jantimon/html-webpack-plugin) from 3.2.0 to 4.0.3.
- [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/v3.2.0...v4.0.3)

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

package.json

@@ -53,7 +53,7 @@
     "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-react": "^7.17.0",
     "file-loader": "^5.0.2",
-    "html-webpack-plugin": "^3.2.0",
+    "html-webpack-plugin": "^4.0.3",
     "jest": "^24.1.0",
     "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.13.0",