Building the .NET Standard 1.3 displays a build warning due to it relying on a beta Microsoft package. While this would be resolved by #22, it is an obsolete target.
Also, since installing the .NET 5.0 SDK (which takes precedence over other versions), it appears to be no longer possible to build the .NET 3.5 target. While forcing a specific SDK version works this done with a global file rather than a command line switch so isn't desirable. According to support docs .NET 3.5 is still supported until 2029 so it is a bit annoying that the tooling no longer appears to support it. Consider looking into doing a separate MSBuild based compile for 3.5 as long as it is still fully automatic for the NuGet package build. Otherwise, drop it as well.
Building the .NET Standard 1.3 displays a build warning due to it relying on a beta Microsoft package. While this would be resolved by #22, it is an obsolete target.
Also, since installing the .NET 5.0 SDK (which takes precedence over other versions), it appears to be no longer possible to build the .NET 3.5 target. While forcing a specific SDK version works this done with a global file rather than a command line switch so isn't desirable. According to support docs .NET 3.5 is still supported until 2029 so it is a bit annoying that the tooling no longer appears to support it. Consider looking into doing a separate MSBuild based compile for 3.5 as long as it is still fully automatic for the NuGet package build. Otherwise, drop it as well.