Bump certifi from 2020.4.5.1 to 2020.6.20 (from PR #1249)
Bump certifi from 2020.4.5.1 to 2020.6.20 (from PR #1249)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.4.5.1 to 2020.6.20.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2020.04.05.1...2020.06.20)

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

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