chore(package): update css-loader to version 3.4.0

Closes #36

Author: greenkeeper[bot]

package.json

@@ -4,7 +4,7 @@
   "version": "2.14.0",
   "devDependencies": {
     "cross-env": "^5.2.0",
-    "css-loader": "3.0.0",
+    "css-loader": "3.4.0",
     "cypress": "^3.2.0",
     "http-server": "^0.11.1",
     "mini-css-extract-plugin": "^0.7.0",