Make twine more verbose

This was helpful to debug a pypi upload issue

Author: Stefan Klug

.appveyor.yml

@@ -68,5 +68,5 @@ deploy:
 after_deploy:
   - echo "Starting Artifact Deployment"
   - ps: Push-AppveyorArtifact dist/*
-  - ps: If ($env:APPVEYOR_REPO_TAG -eq "true") { Invoke-Expression "$env:PYTHON\\Scripts\\twine upload --skip-existing dist/*" 2>$null } Else { write-output "Not on a tag, won't deploy to pypi"}
+  - ps: If ($env:APPVEYOR_REPO_TAG -eq "true") { Invoke-Expression "$env:PYTHON\\Scripts\\twine upload --verbose --skip-existing dist/*" 2>$null } Else { write-output "Not on a tag, won't deploy to pypi"}
   - echo "Finished Artifact Deployment"