Bump webpack-cli from 3.3.10 to 4.3.0

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.10 to 4.3.0.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/v3.3.10...webpack-cli@4.3.0)

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

Author: dependabot-preview[bot]

package.json

@@ -50,7 +50,7 @@
     "sass-loader": "^8.0.2",
     "style-loader": "^1.1.3",
     "webpack": "^4.10.1",
-    "webpack-cli": "^3.3.10"
+    "webpack-cli": "^4.3.0"
   },
   "dependencies": {},
   "jest": {