Update dependency react-native-share to v2

Thalia Technicie
2019-08-03T19:21:08+02:00

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [react-native-share](https://github.com/react-native-community/react-native-share) | dependencies | major | [`1.2.1` -> `2.0.0`](https://re...