Bump css-loader from 3.0.0 to 3.1.0 in /js

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.0.0 to 3.1.0.
- [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/v3.0.0...v3.1.0)

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

js/package.json

@@ -31,7 +31,7 @@
     "@babel/polyfill": "^7.4.4",
     "@babel/preset-env": "^7.4.5",
     "babel-loader": "^8.0.6",
-    "css-loader": "^3.0.0",
+    "css-loader": "^3.1.0",
     "karma": "^4.2.0",
     "mini-css-extract-plugin": "^0.7.0",
     "style-loader": "^0.23.1",