1.1.0

Added

• Availability.AWAITING_PERMISSION: the system is asking the user whether
  this program may use Bluetooth. It is also an UnavailableReason, so an
  exhaustive match on the reasons needs a case for it.

Changed

• macOS: open_bluetooth no longer waits for the user to answer the
  permission dialog. The availability is AWAITING_PERMISSION until they do,
  then USABLE or NOT_ALLOWED.
• macOS: when macOS ends the helper process because the program has no
  usage description, the open_bluetooth() block raises
  aio_rfcomm.macos.MissingUsageDescriptionError, a RuntimeError. This is
  the program's mistake, so it is no longer reported as NOT_ALLOWED.

Fixed

• macOS: open_bluetooth never returned on a machine where nobody can answer
  the permission dialog, such as a CI runner.
• macOS: a refused permission was reported as UNSUPPORTED rather than
  NOT_ALLOWED.
• macOS: open_bluetooth never returned on a Mac whose Bluetooth never comes
  up, such as GitHub's macOS runners with their virtual controller. The
  availability is now UNSUPPORTED.
• macOS: the permission dialog and Privacy & Security show the name passed to
  aio_rfcomm.macos.prompt_under_name() instead of "AioRfcommHelper".
• macOS: a program that ended while the permission dialog was open waited two
  seconds for the helper process, then logged a warning and killed it. The
  helper now exits at once.
• macOS: if the Bluetooth service restarted while the permission dialog was
  open, the availability became UNSUPPORTED and stayed so after the user
  allowed Bluetooth. It now stays AWAITING_PERMISSION until the answer.
• macOS: the message for a refused permission ended with a note about
  prompt_under_name() that only a programmer could act on. It now names the
  program as System Settings shows it instead. So does the message for an
  open permission dialog.

1.0.0

Initial release.