.NET 5 support

[akarlin-dil]

Hey guys, we tried upgrading our application to .NET 5 and we're getting the following error so I wonder when you're planning to release the version that's going to support .NET 5 or maybe there's some workaround in the meantime that we can use to make it work:

Unable to activate type 'Thinktecture.Net.Http.Adapters.HttpClientAdapter'. The following constructors are ambiguous:
Void .ctor(System.Net.Http.HttpMessageHandler)
Void .ctor(System.Net.Http.HttpClient))

[PawelGerr]

The new beta supports .NET 5: https://www.nuget.org/packages/Thinktecture.Net.Http.Abstractions/3.0.0-beta01