Merge pull request mui#38 from ctrlplusb/greenkeeper-webpack-node-externals-1.3.2

Update webpack-node-externals to version 1.3.2 🚀

Author: ctrlplusb

package.json

@@ -72,6 +72,6 @@
     "webpack": "2.1.0-beta.20",
     "webpack-dev-middleware": "1.6.1",
     "webpack-hot-middleware": "2.12.2",
-    "webpack-node-externals": "1.3.0"
+    "webpack-node-externals": "1.3.2"
   }
 }