chore(package): update react to version 15.4.0 (#228)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -51,7 +51,7 @@
     "diff": "3.0.1",
     "in-publish": "2.0.0",
     "nyc": "9.0.1",
-    "react": "15.3.2",
+    "react": "15.4.0",
     "rimraf": "2.5.4",
     "source-map-support": "0.4.6",
     "standard-version": "3.0.0",