Bump certifi from 2019.11.28 to 2020.4.5.1 (from PR #1184)
Bump certifi from 2019.11.28 to 2020.4.5.1 (from PR #1184)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2019.11.28 to 2020.4.5.1.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2019.11.28...2020.04.05.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

mozilla/ichnaea,mozilla/ichnaea,mozilla/ichnaea,mozilla/ichnaea