readme: update doc for RN dependency

Author: zxcpoiu

README.md

@@ -15,7 +15,10 @@ To understand the benefits of **Voip Push Notification**, please see [VoIP Best
 
 **Note 2** This module is inspired by [PushNotificationIOS][6] and [React Native Push Notification][7]
 
-## Version
+## RN Version
+
+* 1.1.0+ ( RN 40+ )
+* 2.0.0+ (RN 60+)
 
 If you're using React Native >= 0.40, make sure to use react-native-voip-push-notification >= 1.1.0