Bump pytz from 2019.3 to 2020.1

WKDV Botrequested to merge
dependabot/pip/pytz-2020.1 into develop

Bumps pytz from 2019.3 to 2020.1.

Commits
  • 164d6af Fix reST lint
  • 416edf6 Test against Python 3.8 and Python 3.9
  • b25606a Bump version numbers to 2020.1/2020a
  • 238b4f6 Base class for all errors
  • fb8b146 Add flake8 settings
  • a11229c IANA 2020a
  • bc11842 Squashed 'tz/' changes from 765984a93..13af01673
  • 7b1a844 Fix remaining references to README.txt
  • f6fd618 Update README.md
  • fd39cf1 Use .rst extension for reStructuredText
  • Additional commits viewable in compare view

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