It's probably a good idea to be specific about what's changing in reno
releases.
Since reno support wasn't in tree we didn't pick up notes for these two
changes, but they're things users might want to know about.
Change-Id: I249a3a4d0cf378b60bf43ce65d49416879d5517e
oslosphinx is the old hotness. openstackdocstheme is the new hotness.
Also, we can use doc/requirements.txt for docs requirements.
Change-Id: I9cbc670c8fb065d240251f061919479c87193ff5
Split up the README into separate documentation files so we can publish
the documentation for git-review.
Change-Id: Idcdf43e73c5ca5b8cb239606236e3b2a660c46b7