CI should produce nupkgs as artifacts

[TOTBWF]

Right now, it is rather tricky to depend on HEAD using paket, as you need to invoke build.sh. I propose that the CI should produce a .nupkg.

As an aside, it appears that the NuGet fake target is borked.

[TOTBWF]

Digging a bit deeper, it appears that the root cause of the pack breakage is fsprojects/Paket#3540, so we may have to upgrade paket

[gusty]

Or drop it and use plain nuget instead.

[TOTBWF]

Oddly enough, paket pack works just fine for me, it's msbuild that is screwing up

[wallymathieu]

Should be easier now to update paket. Specified versions of paket are found here:
https://github.com/fsprojects/FSharpPlus/blob/master/build.cmd#L2
https://github.com/fsprojects/FSharpPlus/blob/master/build.sh#L29-L31

[TOTBWF]

After smashing my head against this for a few hours, I'm starting to think it would just be better to put out a new release. Thoughts?

[gusty]

Yes, let's do that !

[gusty]

The new release is out: https://www.nuget.org/packages/FSharpPlus/1.1.0-CI00271