Update appveyor.yml to include LibGit2Sharp

Signed-off-by: Still Hsu <5843208+Still34@users.noreply.github.com>

appveyor.yml

@@ -6,4 +6,4 @@ before_build:
 - cmd: dotnet restore
 after_build:
 - ps: dotnet build -c Release -o "..\output"
-- ps: Get-ChildItem output -Recurse -Filter LastModifiedPostProcessor.dll | % { Push-AppveyorArtifact $_.FullName }
+- ps: Get-ChildItem -Recurse | Where-Object { $_.Name -match "LibGit2Sharp" -or $_.Name -match "LastModified" } | ForEach-Object { Push-AppveyorArtifact $_.FullName }