The Breaking Changes from version 0.1.* is that you have prepare() method deprecated which you should call before using RNIap methods. Now you have to call prepareAndroid() instead just to know that it is just android dependent method. Also to import module, previously in 0.1.* you only had to do import RNIap from 'react-native-iap' but now you have to do like import * as RNIap from 'react-native-iap'.
For new method, refreshAllItems has been implemented for both ios and android. This feature will support senario for non-consumable products.