RELEASING.md

1. Make sure all changes are live and that Travis is green
2. Delete all packaging-related directories(including dist/)
3. Verify there are no stale overrides
4. Update README.md with release notes
5. Update setup.py with the new version number
6. python3 -m pip install --upgrade setuptools twine wheel
7. python3 setup.py sdist
8. python3 setup.py bdist_wheel
9. python3 -m twine check dist/*
10. python3 -m twine upload dist/*
11. Commit everything from the release
12. git push
13. Create a release on GitHub