update packaging for .net 5

[baronfel]

This MR updates the packaging of this project (which is awesome, thanks by the way!) to support .net 5. There are no breaking API changes, it just means that we don't hit the old netstandard2.0 pathway which drags in Aspnetcore dependencies that aren't the framework reference.

[twitchax]

Hell yeah: I've been meaning to do this. Any ideas what the build failure is? Looks like there is just some issue finding the tests?

[baronfel]

yeah, that was it exactly. I forgot the formatting of TargetFramework vs TargetFrameworks

[baronfel]

Just a bit more work on making the netcoreapp3.1 sdk availble as well, then this should be good to go.

[twitchax]

@baronfel, I'll be honest: I've been dabbling in a lot of Rust lately and have not kept up on the .NET 5 news as much as I normally would have.

Do we still need to keep the netstandard2.0 targets around? Assuming yes for back compat?

[baronfel]

Yep! Generally for a library like this I recommend:

• netstandard2.0 - for .net framework 48+ folks
• netcoreapp3.1 - for LTS support
• net5 - for latest awesomeness

[baronfel]

How's rust working for you? I'm mostly an F# guy myself and so knowing that it exists makes me more comfortable working on systems programming :)

[baronfel]

There we go, green at last :)

[twitchax]

Rust is fantastic: I highly recommend it. :)