Bump requests from 2.18.4 to 2.20.0 in /intro-mdp

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](psf/requests@v2.18.4...v2.20.0)

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

Author: dependabot[bot]

intro-mdp/requirements.txt

@@ -2,6 +2,6 @@ ciscosparkapi==0.9.2
 ncclient==0.6.4
 netmiko==1.4.2
 pyang==1.7.4
-requests==2.18.4
+requests==2.20.0
 urllib3==1.22
 xmltodict==0.11.0