Update pygithub to 1.50

[pyup-bot]

This PR updates PyGithub from 1.47 to 1.50.

Changelog

1.50

-----------------------------------
**New features**

* PyGithub now supports type checking thanks to (1231) (91433fe9)
* Slack is now the main channel of communication rather than Gitter (6a6e7c26)
* Ability to retrieve public events (1481) (5cf9950b)
* Add and handle the maintainer_can_modify attribute in PullRequest (1465) (e0997b43)
* List matching references (1471) (d3bc6a5c)
* Add create_repository_dispatch (1449) (edcbdfda)
* Add some Organization and Repository attributes. (1468) (3ab97d61)
* Add create project method (801ea385)

**Bug Fixes & Improvements**

* Drop use of shadow-cat for draft PRs (1469) (84bb69ab)
* AuthenticatedUser.get_organization_membership() should be str (1473) (38b34db5)
* Drop documentation for len() of PaginatedList (1470) (70462598)
* Fix param name of projectcard's move function (1451) (bafc4efc)
* Correct typos found with codespell (1467) (83bef0f7)
* Export IncompletableObject in the github namespace (1450) (0ebdbb26)
* Add GitHub Action workflow for checks (1464) (f1401c15)
* Drop unneeded ignore rule for flake8 (1454) (b4ca9177)
* Use pytest to parametrize tests (1438) (d2e9bd69)

Links

• PyPI: https://pypi.org/project/pygithub
• Changelog: https://pyup.io/changelogs/pygithub/
• Repo: http://pygithub.readthedocs.io/en/latest/

[codecov]

Codecov Report

Merging #1579 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1579   +/-   ##
=======================================
  Coverage   76.26%   76.26%           
=======================================
  Files         123      123           
  Lines        4580     4580           
  Branches      547      547           
=======================================
  Hits         3493     3493           
  Misses        912      912           
  Partials      175      175           

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