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>

Author: dependabot-support

requirements.txt

@@ -8,6 +8,6 @@ pluggy==0.8.0
 py==1.7.0
 PyJWT==1.6.4
 pytest==3.9.3
-requests==2.20.0
+requests==2.22.0
 six==1.12.0
 urllib3==1.25.2