Bump pytz from 2020.1 to 2020.4 (#784)
Bump pytz from 2020.1 to 2020.4 (#784)

Bumps [pytz](https://github.com/stub42/pytz) from 2020.1 to 2020.4.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](https://github.com/stub42/pytz/compare/release_2020.1...release_2020.4)

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

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
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