NuGet.config breaks `dotnet build`

Hi, TDE for the book here - pleased to meet you!

The certificate for dotnet.myget.org has expired and from what I read online, they're not planning to renew it at all. This line therefore causes issues with dotnet build - but at least in my environment, when I removed it entirely it "just worked" ("it" being dotnet restore && dotnet build), probably because dotnet-core can already be found in official NuGet repos?

functional-csharp-code-2/NuGet.Config

Line 4 in b61d0a7

    
           <add key="dotnet-core" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />

Hi René, thanks so much for looking into this. This is now fixed :-)