fix(package): update react-dom to version 15.4.1

https://greenkeeper.io/

package.json

@@ -176,7 +176,7 @@
     "react": "15.3.2",
     "react-addons-css-transition-group": "15.3.2",
     "react-cookie": "0.4.8",
-    "react-dom": "15.3.2",
+    "react-dom": "15.4.1",
     "react-helmet": "3.2.2",
     "react-onclickoutside": "5.7.1",
     "react-redux": "4.4.6",