v1.3.1

Added

• The app bundle now embeds its licence identifier and product description in
  Info.plist.
• A repository statistics card, generated daily to the stats branch, in the
  README.

Changed

• The decisions behind starting, stopping and recovering output (what a failed
  start means, what to do when a display goes away, when to retry, when Start
  and Stop are offered) moved from AppModel into OpenPromptrCore and are
  unit-tested. No behavior change intended.