Bump webpack-cli from 3.3.12 to 4.1.0

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.1.0.
- [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/v3.3.12...webpack-cli@4.1.0)

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

package.json

@@ -70,7 +70,7 @@
     "minami": "^1.2.3",
     "uglifyjs-webpack-plugin": "^2.2.0",
     "webpack": "^4.44.1",
-    "webpack-cli": "^3.3.12",
+    "webpack-cli": "^4.1.0",
     "webpack-merge": "^5.1.3"
   },
   "dependencies": {