Bump requests from 2.18.4 to 2.20.0

Bumps [requests](https://github.com/psf/requests) from 2.18.4 to 2.20.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](https://github.com/psf/requests/compare/v2.18.4...v2.20.0)

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

requirements.txt

@@ -28,7 +28,7 @@ python-dotenv==0.7.1
 python-editor==1.0.3
 pytz==2017.2
 redis==3.2.1
-requests==2.18.4
+requests==2.20.0
 rq==1.0
 six==1.11.0
 SQLAlchemy==1.1.14