fix(ps): fix deployment

only specify a version suffix if there is a tag

Author: jaredcnance

Build.ps1

@@ -3,4 +3,6 @@ $revision = "{0:D4}" -f [convert]::ToInt32($revision, 10)
 
 dotnet restore .\src\JsonApiDotNetCore\JsonApiDotNetCore.csproj
 dotnet build .\src\JsonApiDotNetCore -c Release
-dotnet pack .\src\JsonApiDotNetCore -c Release -o .\artifacts --version-suffix=$revision
+
+If($env:APPVEYOR_REPO_TAG) { dotnet pack .\src\JsonApiDotNetCore -c Release -o .\artifacts }
+Else { dotnet pack .\src\JsonApiDotNetCore -c Release -o .\artifacts --version-suffix=$revision }