chore(package): update react to version 16.4.0

Closes #40

Author: greenkeeper[bot]

Diff for: package.json

@@ -79,7 +79,7 @@
     "nodemon": "^1.10.2",
     "nsp": "^2.6.1",
     "prop-types": "^15.5.8",
-    "react": "^15.5.4",
+    "react": "^16.4.0",
     "react-a11y": "^0.3.3",
     "react-addons-test-utils": "^15.3.1",
     "react-dom": "^15.5.4",