update install instructions (#1884)
update install instructions (#1884)


wannyk/react-native-maps,wannyk/react-native-maps,lelandrichardson/react-native-maps,pjamrozowicz/react-native-maps,lelandrichardson/react-native-maps,lelandrichardson/react-native-maps,pjamrozowicz/react-native-maps,wannyk/react-native-maps,zigbang/react-native-maps,zigbang/react-native-maps,wannyk/react-native-maps,pjamrozowicz/react-native-maps,zigbang/react-native-maps