Bump requests from 2.20.0 to 2.22.0

Bumps [requests](https://github.com/requests/requests) from 2.20.0 to 2.22.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/kennethreitz/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.20.0...v2.22.0)

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

requirements.txt

@@ -47,7 +47,7 @@ pytest-django==3.8.0
 python-dateutil==2.7.3
 pytz==2018.5
 regex==2020.1.8
-requests==2.19.1
+requests==2.22.0
 six==1.11.0
 snowballstemmer==1.2.1
 Sphinx==2.3.1