Bump css-loader from 3.3.2 to 3.4.0

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.3.2 to 3.4.0.
- [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/v3.3.2...v3.4.0)

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

package.json

@@ -60,7 +60,7 @@
 		"babel-eslint": "^10.0.3",
 		"babel-jest": "^24.9.0",
 		"babel-loader": "^8.0.6",
-		"css-loader": "^3.3.2",
+		"css-loader": "^3.4.0",
 		"eslint": "^4.19.1",
 		"eslint-config-standard": "^11.0.0",
 		"eslint-friendly-formatter": "^4.0.1",