Bump webpack-cli from 3.2.1 to 4.7.0

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.2.1 to 4.7.0.
- [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/v.3.2.1...webpack-cli@4.7.0)

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

package.json

@@ -48,7 +48,7 @@
     "typescript": "^3.3.3",
     "uuid": "^3.3.2",
     "webpack": "^4.28.4",
-    "webpack-cli": "^3.2.1",
+    "webpack-cli": "^4.7.0",
     "webpack-dev-server": "^3.1.14"
   },
   "dependencies": {