Perch 0.1.1

• The Mac app can update itself. macOS builds now include the signed
  update bundle, which 0.1.0 left out, so the Mac app finds and installs
  new releases like the Windows and Linux ones do.
• perch tui: q closes the Ports box, as it quits from the list; keys
  typed after it no longer run as box actions. A port's link is underlined
  across the URL only, not to the box's edge.
• README: screenshots of the current app, including perch tui.