Support .net 6

[pbiggar]

Description

with paket 6.0.0-beta10, the "framework" tag cannot be set to net6.0

Repro steps

create paket file like so:

version 6.0.0-beta10

source https://api.nuget.org/v3/index.json
framework: net6.0
storage: none

Then run dotnet paket install

Expected behavior

It works.

Actual behavior

Paket failed with
-> Error in paket.dependencies line 4
     Could not parse framework 'net6.0'. Try to update or install again or report a paket bug.

[pbiggar]

Perhaps there is a different way to use .net 6 (preview 3), but this seemed the natural way and it didn't work. I couldn't find docs or issues pointing to another way to do it.

[smoothdeveloper]

@pbiggar I've seen it but haven't had chance to hack on it.

There is probably adjustments to make to this file in the first place:
https://github.com/fsprojects/Paket/blob/master/src/Paket.Core/Versioning/FrameworkHandling.fs

As well as adding a test case:
https://github.com/fsprojects/Paket/tree/master/integrationtests/scenarios

[pbiggar]

Thanks so much, and for the speedy update. I'll check it out this week.

[pbiggar]

This seems to work, see darklang/dark#3044

Thanks!

[smoothdeveloper]

@pbiggar thanks for the update, could you close the issue (and we create another one if there is still something down the line)?