Fix warning in RN >= 0.58 (#2671)
Fix warning in RN >= 0.58 (#2671)

fixes #2620 YellowBox warning on react-native 0.58.0-rc.1
wannyk/react-native-maps,wannyk/react-native-maps,lelandrichardson/react-native-maps,lelandrichardson/react-native-maps,lelandrichardson/react-native-maps,wannyk/react-native-maps,wannyk/react-native-maps