Release process — agate 1.7.1 documentation

# Release process

If substantial changes were made to the code:

1. Ensure any new modules have been added to setup.py’s `packages` list

2. Ensure any new public interfaces have been added to the documentation

3. Ensure TableSet proxy methods have been added for new Table methods

Then:

1. All tests pass on continuous integration

2. The changelog is up-to-date and dated

3. The version number is correct in:

     - setup.py

     - docs/conf.py

4. Check for new authors: `git log --invert-grep --author='James McKinney'`

5. Run `python charts.py` to update images in the documentation

6. Tag the release: `git tag -a x.y.z -m 'x.y.z release.'; git push --follow-tags`

7. Upload to PyPI: `rm -rf dist; python setup.py sdist bdist_wheel; twine upload dist/*`

8. Build the documentation on ReadTheDocs manually