2021.08.1

Providers:

• Added OpenStreetMap.BlackAndWhite (#83)
• Added Gaode tiles (Normal and Satellite) (#83)
• Expanded NASAGIBS tiles with ModisTerraBands721CR, ModisAquaTrueColorCR, ModisAquaBands721CR and ViirsTrueColorCR (#83)
• Added metadata to Strava maps (currently down) (#83)