Merge pull request #8 from zeit/greenkeeper-react-dom-15.3.0

Update react-dom to version 15.3.0 🚀

Author: leo

package.json

@@ -35,7 +35,7 @@
     "jsdom": "9.4.1",
     "lolex": "1.5.1",
     "react": "15.3.0",
-    "react-dom": "15.2.1"
+    "react-dom": "15.3.0"
   },
   "scripts": {
     "gulp": "gulp",