Fix flow definition for firestack.store()
Fix flow definition for firestack.store()

sraka1/react-native-firestack,sraka1/react-native-firestack,sraka1/react-native-firestack,devshackio/react-native-firestack,devshackio/react-native-firestack,devshackio/react-native-firestack,sraka1/react-native-firestack,devshackio/react-native-firestack