https://github.com/npgsql/npgsql/blob/32ccecfe96ec973837c3a76d0e84844c96e3d4b0/Directory.Build.props#L13 The default logo is being used on nuget  Image also needs to be linked using https 
npgsql/Directory.Build.props
Line 13 in 32ccecf
The default logo is being used on nuget
Image also needs to be linked using https