Releasing lingrex

Do platform test via tox:
```
tox -r
```
test if the workflow scripts still work:
```
pytest -m"workflow"
```
Make sure statement coverage >= 99%
Use black and flake8 to make the code unified:
```
flake8 src
black src/lingrex/*.py
```
Update the version number, by removing the trailing .dev0 in:
- setup.cfg
- src/lingrex/__init__.py
Check metadata in .zenodo.json
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 setup.py sdist bdist_wheel
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/lingrex/__init__.py

Commit/push the version change:

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