update LibGit2Sharp to 0.27.0-preview-0007#327

Merged

AArnott merged 6 commits intodotnet:masterfrom ctaggart:LibGit2Sharp

May 9, 2019

+35-44

Commits on Apr 21, 2019

Commits on Apr 23, 2019

Add displayName to script steps
AArnott
committed

Commits on Apr 24, 2019

Switch to a dotnet SDK that works on Alpine
AArnott
committed

Commits on Apr 25, 2019

remove Alpine test validation
ctaggart
committed