Add note about #180
Add note about #180

leaflet-extras/leaflet-providers,andreaswc/leaflet-providers,kyroskoh/leaflet-providers,andreaswc/leaflet-providers,kyroskoh/leaflet-providers,tomhughes/leaflet-providers,leaflet-extras/leaflet-providers,tomhughes/leaflet-providers,ximex/leaflet-providers,ximex/leaflet-providers