Loosen RN dependency version match criteria

Author: Joe McKie

package.json

@@ -43,7 +43,7 @@
     "eslint-plugin-react-native": "1.0.2",
     "mocha": "2.5.3",
     "react": "^15.4.0",
-    "react-native": "0.38.0"
+    "react-native": "^0.38.0"
   },
   "dependencies": {
     "cubic-bezier": "^0.1.2",