Bump requests from 2.12.1 to 2.20.0 in /Graph/movie_recommendations

Bumps [requests](https://github.com/requests/requests) from 2.12.1 to 2.20.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.12.1...v2.20.0)

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

Graph/movie_recommendations/requirements.txt

@@ -1,4 +1,4 @@
 elasticsearch==5.0.1
-requests==2.12.1
+requests==2.20.0
 six==1.10.0
 urllib3==1.19.1