README.dev.rst

Steps for doing a release:

1. Make a release branch
2. Review open issues and PRs to see if any can easily be fixed, closed, or merged.
3. Bump copyright year in README.rst, docs/conf.py, and docs/index.rst, if necessary.
4. Review HISTORY.rst for completeness and correctness.
5. Add release date to HISTORY.rst.
6. Install or update gh as it used by the release script.
7. Run dev-bin/release.sh and follow the prompts.
8. Verify the release on GitHub and PyPI.