fix(package): update react-dom to version 16.4.2

Closes #52

Author: greenkeeper[bot]

package.json

@@ -9,7 +9,7 @@
     "lodash": "^4.17.4",
     "prop-types": "^15.5.10",
     "react": "^16.4.2",
-    "react-dom": "^16.0.0",
+    "react-dom": "^16.4.2",
     "react-scripts": "1.0.14"
   },
   "scripts": {