How to make a new release of `pygraphviz`

Update the release notes:
1. Review and cleanup doc/source/reference/api_notes.rst and doc/source/reference/news.rst,
2. Fix code in documentation by running cd doc && make doctest.
Toggle dev = True to dev = False in pygraphviz/release.py.
Commit changes.
Add the version number as a tag in git:
```
git tag -s [-u <key-id>] pygraphviz-<major>.<minor>
```
(If you do not have a gpg key, use -m instead; it is important for Debian packaging that the tags are annotated)
Push the new meta-data to github:
```
git push --tags upstream master
```
(where upstream is the name of the

github.com:pygraphviz/pygraphviz repository.)
Review the github release page:

https://github.com/pygraphviz/pygraphviz/releases

Publish on PyPi:

git clean -fxd
python setup.py sdist --formats=zip
twine upload -s dist/pygraphviz*.zip

Update documentation on the web: The documentation is kept in a separate repo: pygraphviz/documentation
- Sync your branch with the remote repo: git pull.
- Copy the built documentation.

Increase the version number

Toggle dev = False to dev = True in pygraphviz/release.py.

Update version in pygraphviz/release.py.

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