First install development dependencies. Make sure you're on master branch with all changes that are going to be released.
pip install -e '.[dev]'
Then run bumpversion part to bump version of the script. part may be either patch, minor or major, decide
which one to use according to semantic versioning. bumpversion will bump script's version
in files inside repository, commit the changes and tag the commit with vX.Y.Z tag, where X.Y.Z is the current
version of the script. Now push the commit and the tag.
git push origin && git push origin vX.Y.Z
The new version has already been tagged in git repository, now it's time to release a new version on PyPI. Run python setup.py sdist to build the package for the new release, check if build was successful by running twine check dist/*. If everything is alright run
twine upload dist/*
to release a new version to PyPI.