tweak readme on how to run against diff envs
tweak readme on how to run against diff envs

luggg/react-native-config,luggit/react-native-config,luggit/react-native-config,luggit/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggit/react-native-config,luggg/react-native-config