docs: update React Native AsyncStorage module

Author: dplewis

README.md

@@ -72,7 +72,7 @@ For React Native applications, include `'parse/react-native.js'`:
 const Parse = require('parse/react-native.js');
 
 // On React Native >= 0.50 and Parse >= 1.11.0, set the Async
-const AsyncStorage = require('react-native').AsyncStorage;
+const AsyncStorage = require('@react-native-async-storage/async-storage');
 Parse.setAsyncStorage(AsyncStorage);
 ```