Bump requests from 2.19.1 to 2.20.0

Bumps [requests](https://github.com/psf/requests) from 2.19.1 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@v2.19.1...v2.20.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -22,7 +22,7 @@ psycopg2-binary==2.9.1
 python-dotenv==0.19.0
 pytz==2021.1
 PyYAML==3.12
-requests==2.19.1
+requests==2.20.0
 sqlparse==0.4.1
 tablib==3.0.0
 unicodecsv==0.14.1