Bump watchdog from 0.9.0 to 0.10.3

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 0.9.0 to 0.10.3.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v0.9.0...v0.10.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -3,4 +3,4 @@ Werkzeug==0.16.0
 click==7.0
 gevent-websocket==0.10.1
 gevent==1.4.0
-watchdog==0.9.0
+watchdog==0.10.3