(maint) Update appveyor to output powershell versions

Previously the appveyor test setup didn't ouput the PowerShell versions being
tested.  This is useful when debugging and reproducing test failures.

Author: glennsarti

.sync.yml

@@ -27,5 +27,10 @@ spec/default_facts.yml:
 .travis.yml:
   unmanaged: true
 
+appveyor.yml:
+  test_script:
+  - pwsh -NoProfile -NoLogo -NonInteractive -Command $PSVersionTable
+  - powershell -NoProfile -NoLogo -NonInteractive -Command $PSVersionTable
+
 .gitlab-ci.yml:
   delete: true