Update react-native peer dependency version (#301)

Author: edcs

package.json

@@ -49,7 +49,7 @@
   "license": "MIT",
   "peerDependencies": {
     "invariant": "^2.2.2",
-    "react-native": "^0.50.3"
+    "react-native": ">=0.50.3"
   },
   "devDependencies": {
     "all-contributors-cli": "^4.9.1",