Perch 0.1.2

• Exiting a terminal closes only its tab. Typing exit in one of a
  project's terminals also closed every other tab of that project; now only
  its own tab closes.
• Background dev servers show up in Ports again when Perch runs as a
  systemd user service. A dev server started with & or nohup from a shell
  that has since exited (or by an agent) was hidden as part of Perch itself;
  it's now listed under the project that started it, and the tunnel forwards
  it.

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.