Releasing clld-ipachart-plugin

PEP8
```
flake8 src
```
Do platform test via tox (making sure statement coverage is at 100%):
```
tox -r
```
Change setup.cfg version to the new version number.
Bump version number:
```
git commit -a -m"<VERSION>"
```

Create a release tag:

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

Release to PyPI:

python setup.py clean --all
rm dist/*
python -m build -n
twine upload dist/*

Push to github:
```
git push origin
git push --tags
```
Append .dev0 to the version number in setup.cfg for the new development cycle.

Commit/push the version change:

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