Skip upload to pypi if exists.

.gitlab-ci.yml

@@ -33,6 +33,7 @@ pypi_publish:
     - pip install twine
     - python setup.py sdist bdist_wheel
     - python -m twine upload
+     --skip-existing
      --repository-url https://pypi.clarin-pl.eu/
      -u $PIPY_USER
      -p $PIPY_PASS