Add release notes for Review Board 4.0 beta 1.
Review Request #11337 — Created Dec. 16, 2020 and submitted
This covers the new multi-commit review request support, new
administration UI, read-only mode, integrations, extension improvements,
new APIs, bug fixes, and Python 3/Django 1.11 support.
This is pretty comprehensive, though there's still plenty of
behind-the-scenes changes that aren't covered (but which have been sent
by contributors). A special thank-you note has been added to the end.
Built the docs. Checked all links (only one is broken, and that's due to
currently missing Discord docs). Checked for build errors and spelling
Do we really want to keep suggesting easy_install at this point?