Add missing react-dom dependency

Author: Aljullu

package.json

@@ -23,6 +23,7 @@
     "jest": "^22.4.0",
     "path": "^0.12.7",
     "react": "^16.2.0",
+    "react-dom": "^16.2.0",
     "webpack": "^3.11.0"
   },
   "scripts": {