Update deprecated getConstants() call (#1379)
Update deprecated getConstants() call (#1379)

This removes the React Native warning:

*Accessing view manager configs directly off UIManager via UIManager['getConstants'] is no longer supported. Use UIManager.getViewManagerConfig('getConstants') instead.*
kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler,kmagiera/react-native-gesture-handler