Bump requests from 2.10.0 to 2.20.0 (#438)

Bumps [requests](https://github.com/psf/requests) from 2.10.0 to 2.20.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.10.0...v2.20.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -17,7 +17,7 @@ psycopg2==2.6.2
 py-bcrypt==0.4
 Pygments==2.1.3
 pytz==2016.4
-requests==2.10.0
+requests==2.20.0
 six==1.10.0
 snowballstemmer==1.2.1
 SQLAlchemy==1.3.3