change the style of the map

[carrabre]

• https://github.com/react-native-community/react-native-maps
• https://github.com/nshaposhnik/react-native-maps-example
• https://codeburst.io/react-native-build-full-fledged-module-with-google-maps-and-places-apis-ef2f6ccb0964

[cormacncheese]

iOS successfully implemented.

Android testing still needed

See: https://github.com/react-native-maps/react-native-maps/blob/master/docs/installation.md