Update dependency react-native-firebase to v5.5.6

Thalia Technicie
2019-11-14T13:59:50+01:00

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [react-native-firebase](https://github.com/invertase/react-native-firebase) | dependencies | patch | [`5.5.5` -> `5.5.6`](https://renovateb...