v1.2.1

First release with GitHub-based self-updates (Plugin Update Checker 5.7).

• Guest picker now caps itself at the largest room's actual max_guests
  (fetched from /api/{slug}/rooms), instead of always offering up to
  the max_guests setting regardless of what any room holds.
• Sites on 1.2.0 or earlier need one manual reinstall from this
  release; every version after this one updates itself in wp-admin.