Uses deprecated "rnpm" config that will stop working from next release

[vanyasem]

The following packages use deprecated "rnpm" config that will stop working from next release:

• react-native-push-notification-ce: https://npmjs.com/package/react-native-push-notification-ce Please notify their maintainers about it. You can find more details at https://github.com/react-native-community/cli/blob/master/docs/configuration.md#migration-guide.