Bump webpack-cli from 3.3.12 to 4.0.0

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.0.0.
- [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@4.0.0)

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

package.json

@@ -74,7 +74,7 @@
   "vue-style-loader": "^4.1.2",
   "vue-template-compiler": "^2.6.12",
   "webpack": "^4.44.2",
-  "webpack-cli": "^3.3.12",
+  "webpack-cli": "^4.0.0",
   "webpack-dev-server": "^3.11.0",
   "webpack-pwa-manifest": "^4.2.0"
  },