chore(package): update css-loader to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -69,7 +69,7 @@
     "chai": "^4.2.0",
     "chai-string": "^1.5.0",
     "coveralls": "^3.0.2",
-    "css-loader": "^2.1.0",
+    "css-loader": "^3.0.0",
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "html-webpack-plugin": "^3.2.0",
     "husky": "^2.0.0",