Merge pull request #402 from textpattern/greenkeeper/css-loader-3.4.0

Update css-loader to the latest version 🚀

Author: philwareham

package.json

@@ -20,7 +20,7 @@
     "autoprefixer": "9.7.3",
     "clean-webpack-plugin": "3.0.0",
     "cross-env": "6.0.3",
-    "css-loader": "3.3.2",
+    "css-loader": "3.4.0",
     "mini-css-extract-plugin": "0.8.1",
     "postcss-loader": "3.0.0",
     "sass": "1.23.7",