Supported force-npm option for create-react-native-app. (#307)
Supported force-npm option for create-react-native-app. (#307)

* Supported force-npm option for create-react-native-app.

* Supported --package-manager option which allows yarn,npm and specific path to command.

chochihim/create-react-native-app,react-community/create-react-native-app