chore(package): update react-dom to version 15.5.1

Closes #28

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -61,7 +61,7 @@
   },
   "peerDependencies": {
     "react": ">=0.14.0",
-    "react-dom": "~0.14.2"
+    "react-dom": "~15.5.1"
   },
   "devDependencies": {
     "babel-core": "~6.18.2",