update documentation
update documentation

devfd/react-native-geocoder,devfd/react-native-geocoder,jgkim/react-native-geocoder,devfd/react-native-geocoder,jgkim/react-native-geocoder,umfana/react-native-geocoder,devfd/react-native-geocoder,jgkim/react-native-geocoder,jgkim/react-native-geocoder