Set version to '3.0.0'

Merge pull request #181 from mono/fix-net9-preview

Don't try to pass langversion 13 just yet

Merge pull request #179 from mono/dotnet-env-var

Respect DOTNET_ROOT env var

Merge pull request #175 from mono/targets-improvements

Targets improvements

Merge pull request #165 from mono/support-netcore-in-vs-tasks

Take TFM into account in build tasks

Set version to 2.3.1

Remove empty snupkgs as NuGet.org rejects them

Release v2.2.1

Set version to '2.2.0'

Release 2.0.5