Release process

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
   • csvkit/cli.py

4. Check for new authors: git log --invert-grep --author='James McKinney'
5. Tag the release: git tag -a x.y.z -m 'x.y.z release.'; git push --follow-tags
6. Upload to PyPI: rm -rf dist; python setup.py sdist bdist_wheel; twine upload dist/*
7. Build the documentation on ReadTheDocs manually