Bump css-loader from 2.0.2 to 2.1.0 in /js

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 2.0.2 to 2.1.0.
- [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/v2.0.2...v2.1.0)

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

js/package.json

@@ -26,7 +26,7 @@
     "@babel/polyfill": "^7.0.0",
     "@babel/preset-env": "^7.2.3",
     "babel-loader": "^8.0.4",
-    "css-loader": "^2.0.2",
+    "css-loader": "^2.1.0",
     "karma": "^3.1.4",
     "mini-css-extract-plugin": "^0.5.0",
     "uglifyjs-webpack-plugin": "^2.1.1",