- update to 2.1.9:
* [fsevents] Fix flakey test to assert that there are no errors when stopping the emitter.
* [inotify] Suppress occasional ``OSError: [Errno 9] Bad file descriptor`` at shutdown.
* [watchmedo] Make ``auto-restart`` restart the sub-process if it terminates.
* [watchmedo] Avoid zombie sub-processes when running ``shell-command`` without ``--wait``.
* Fix adding failed emitters on observer schedule.
* [inotify] Fix hang when unscheduling watch on a path in an unmounted filesystem.
* [watchmedo] Fix broken parsing of ``--kill-after`` argument for the ``auto-restart`` command.
* [watchmedo] Fix broken parsing of boolean arguments.
* [watchmedo] Fix broken parsing of commands from ``auto-restart``, and ``shell-command``.
* [watchmedo] Support setting verbosity level via ``-q/--quiet`` and ``-v/--verbose`` arguments.
* Thanks to our beloved contributors: @taleinat, @kianmeng, @palfrey, @IlayRosenberg, @BoboTiG
* Eliminate timeout in waiting on event queue.
* [inotify] Fix ``not`` equality implementation for ``InotifyEvent``.
* [watchmedo] Fix calling commands from within a Python script.
* [watchmedo] ``PyYAML`` is loaded only when strictly necessary.