chore(package): update react-dom to version 16.4.0

Closes #26

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "in-publish": "^2.0.0",
     "mocha": "^4.0.1",
     "react": "~15.4",
-    "react-dom": "~15.4",
+    "react-dom": "~16.4.0",
     "react-native": "^0.42.0",
     "react-native-mock": "^0.3.1",
     "rimraf": "^2.6.2",