Bump webpack packages

Author: gaearon

packages/react-scripts/package.json

@@ -57,8 +57,8 @@
     "react-error-overlay": "^0.0.0",
     "style-loader": "0.16.1",
     "url-loader": "0.5.8",
-    "webpack": "2.4.1",
-    "webpack-dev-server": "2.4.4",
+    "webpack": "2.5.1",
+    "webpack-dev-server": "2.4.5",
     "webpack-manifest-plugin": "1.1.0",
     "whatwg-fetch": "2.0.3"
   },