Bump css-loader from 0.28.0 to 2.1.1

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 0.28.0 to 2.1.1.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v0.28.0...v2.1.1)

package.json

@@ -13,7 +13,7 @@
     "awesome-typescript-loader": "^5.0.0",
     "core-js": "^3.1.2",
     "cross-env": "5.2.0",
-    "css-loader": "0.28.0",
+    "css-loader": "2.1.1",
     "electron": "^5.0.2",
     "electron-builder": "^20.40.2",
     "electron-installer-snap": "^3.0.0",