Fix appveyor nuget cache invalidation
Fix appveyor nuget cache invalidation

Apparantly, we haven't invalidated our cache in a while...

klightspeed/EDDiscovery,andreaspada/EDDiscovery,andreaspada/EDDiscovery,EDDiscovery/EDDiscovery,EDDiscovery/EDDiscovery,EDDiscovery/EDDiscovery,klightspeed/EDDiscovery,klightspeed/EDDiscovery