TRAVIS: allow present releases on PyPI, so we can handle deploy crashes by travis

Author: MuellerSeb

.travis.yml

@@ -30,7 +30,7 @@ after_success:
     if [[ $TRAVIS_PULL_REQUEST == 'false' ]]; then
       python3 -m pip install twine
       python3 -m twine upload --verbose --skip-existing --repository-url https://test.pypi.org/legacy/ dist/*
-      if [[ $TRAVIS_TAG ]]; then python3 -m twine upload --verbose dist/*; fi
+      if [[ $TRAVIS_TAG ]]; then python3 -m twine upload --verbose --skip-existing dist/*; fi
     fi
 
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