Merge pull request mui#36 from ctrlplusb/greenkeeper-webpack-hot-midd…

…leware-2.12.2

Update webpack-hot-middleware to version 2.12.2 🚀

package.json

@@ -71,7 +71,7 @@
     "url-loader": "0.5.7",
     "webpack": "2.1.0-beta.20",
     "webpack-dev-middleware": "1.6.1",
-    "webpack-hot-middleware": "2.12.1",
+    "webpack-hot-middleware": "2.12.2",
     "webpack-node-externals": "1.3.0"
   }
 }