Support react-leaflet v5

[mdrayer]

The react-leaflet package has been updated to v5 (https://github.com/PaulLeCam/react-leaflet/releases/tag/v5.0.0)

[eYdr1en]

You can use my fork until this will merge like this in you package.json "react-leaflet-fullscreen": "github:eYdr1en/react-leaflet-fullscreen"