Update watchdog to 2.1.8

[pyup-bot]

This PR updates watchdog from 2.1.6 to 2.1.8.

Changelog

2.1.8

~~~~~

2022-05-15 • `full history <https://github.com/gorakhargosh/watchdog/compare/v2.1.7...v2.1.8>`__

- Fix adding failed emitters on observer schedule. (`872 <https://github.com/gorakhargosh/watchdog/issues/872>`__)
- [inotify] Fix hang when unscheduling watch on a path in an unmounted filesystem. (`869 <https://github.com/gorakhargosh/watchdog/pull/869>`__)
- [watchmedo] Fix broken parsing of ``--kill-after`` argument for the ``auto-restart`` command. (`870 <https://github.com/gorakhargosh/watchdog/issues/870>`__)
- [watchmedo] Fix broken parsing of boolean arguments. (`887 <https://github.com/gorakhargosh/watchdog/issues/887>`__)
- [watchmedo] Fix broken parsing of commands from ``auto-restart``, and ``shell-command``. (`888 <https://github.com/gorakhargosh/watchdog/issues/888>`__)
- [watchmedo] Support setting verbosity level via ``-q/--quiet`` and ``-v/--verbose`` arguments. (`889 <https://github.com/gorakhargosh/watchdog/pull/889>`__)
- Thanks to our beloved contributors: taleinat, kianmeng, palfrey, IlayRosenberg, BoboTiG

2.1.7

~~~~~

2022-03-25 • `full history <https://github.com/gorakhargosh/watchdog/compare/v2.1.6...v2.1.7>`__

- Eliminate timeout in waiting on event queue. (`861 <https://github.com/gorakhargosh/watchdog/pull/861>`__)
- [inotify] Fix ``not`` equality implementation for ``InotifyEvent``. (`848 <https://github.com/gorakhargosh/watchdog/pull/848>`__)
- [watchmedo] Fix calling commands from within a Python script. (`879 <https://github.com/gorakhargosh/watchdog/pull/879>`__)
- [watchmedo] ``PyYAML`` is loaded only when strictly necessary. Simple usages of ``watchmedo`` are possible without the module being installed. (`847 <https://github.com/gorakhargosh/watchdog/pull/847>`__)
- Thanks to our beloved contributors: sattlerc, JanzenLiu, BoboTiG

Links

• PyPI: https://pypi.org/project/watchdog
• Changelog: https://pyup.io/changelogs/watchdog/
• Repo: https://github.com/gorakhargosh/watchdog
• Docs: https://pythonhosted.org/watchdog/

[pyup-bot]

Closing this in favor of #286