Update plugins.md (#6258)
Update plugins.md (#6258)

Added Windy Leaflet Plugin
Leaflet/Leaflet,stefanocudini/Leaflet,CapeSepias/Leaflet,stefanocudini/Leaflet,Leaflet/Leaflet,Leaflet/Leaflet,CapeSepias/Leaflet,CapeSepias/Leaflet,stefanocudini/Leaflet