Bump webpack-cli from 3.1.2 to 3.2.0 in /js

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.1.2 to 3.2.0.
- [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/commits)

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

js/package.json

@@ -31,7 +31,7 @@
     "mini-css-extract-plugin": "^0.5.0",
     "uglifyjs-webpack-plugin": "^2.1.1",
     "webpack": "^4.28.3",
-    "webpack-cli": "^3.1.2",
+    "webpack-cli": "^3.2.0",
     "webpack-merge": "^4.2.1"
   },
   "scripts": {