v0.7.2

Fixed

• unifi-map shape says when its artwork counts are measuring an empty cache
  rather than the network. Resolved against a cold cache it reported 0 of 19
  for any network at all, and that section exists precisely so somebody else's
  numbers can tell us how well the fingerprint joins work. The same snapshot
  gives 0 of 19 or 19 of 19 depending only on whether artwork has ever been
  fetched, so reading it as a property of their network was a wrong conclusion
  waiting to be drawn.
• SECURITY.md covers unifi-map shape. A command whose entire purpose is
  producing something to hand to a stranger was absent from the document about
  what this tool discloses, which is the one place somebody assessing it would
  look.