Releasing cldfviz

Do platform test via tox:

tox -r

Make sure flake8 passes:

flake8 src

Update the version number, by removing the trailing .dev0 in:
- setup.cfg
- src/cldfviz/__init__.py
- CHANGELOG.md
Create the release commit:

git commit -a -m "release <VERSION>"

Create a release tag:

git tag -a v<VERSION> -m"<VERSION> release"

Release to PyPI:

rm dist/*
python -m build -n
twine upload dist/*

Push to github:

git push origin
git push --tags

Change version for the next release cycle, i.e. incrementing and adding .dev0
- setup.cfg
- src/cldfviz/__init__.py
Commit/push the version change:

git commit -a -m "bump version for development"
git push origin