Target netcoreapp3.1 (dotnet#767)

Update to dotnet 6.0.100 (dotnet#762)

Update README.md

Update azure-pipelines.yml

Allow empty Virtual Directory (dotnet#480)

Fix reading remote from config (dotnet#345)

Trim trailing whitespace in .git file (dotnet#312)

* Trim trailing whitespace in .git file

* Fix strings

Update SourceLink to 1.0.0-beta2-19322-03 (dotnet#294)

Auto-generate versions of build task assemblies (dotnet#277)

* Auto-generate versions of build task assemblies