chore(package): update css-loader to version 0.28.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "babel-preset-latest": "^6.22.0",
     "babel-preset-react": "^6.11.1",
     "babel-preset-stage-2": "^6.11.0",
-    "css-loader": "^0.27.0",
+    "css-loader": "^0.28.0",
     "eslint-config-xo-react": "^0.11.0",
     "eslint-plugin-react": "^6.9.0",
     "file-loader": "^0.10.1",