Bump requests from 2.2.1 to 2.20.0

Bumps [requests](https://github.com/psf/requests) from 2.2.1 to 2.20.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.2.1...v2.20.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
 Flask==0.10.1
-requests==2.2.1
+requests==2.20.0
 Pillow==3.1.0