Update dependency css-loader to v3

Author: renovate-bot

package.json

@@ -75,7 +75,7 @@
     "browserslist": "4.6.2",
     "clean-webpack-plugin": "3.0.0",
     "cross-env": "5.2.0",
-    "css-loader": "2.1.1",
+    "css-loader": "3.0.0",
     "enzyme": "3.10.0",
     "eslint": "5.16.0",
     "eslint-config-airbnb-base": "13.1.0",