update readme: add point about accessing variables in info.plist (#480)
update readme: add point about accessing variables in info.plist (#480)

* update readme: explain accessing env variables in info.plist

* Update readme: add link to issue about info.plist
luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggit/react-native-config,luggit/react-native-config