Update pygithub to 1.45

[pyup-bot]

This PR updates pygithub from 1.44.1 to 1.45.

Changelog

1.45

-----------------------------------
**Important**

* This is the last release of PyGithub that will support Python 2.

**Breaking Changes**

* Branch.edit_{user,team}_push_restrictions() have been removed
* The new API is:
- Branch.add_{user,team}_push_restrictions() to add new members
- Branch.replace_{user,team}_push_restrictions() to replace all members
- Branch.remove_{user,team}_push_restrictions() to remove members
* The api_preview parameter to Github() has been removed.

**Bug Fixes & Improvements**

* Allow sha=None for InputGitTreeElement (1327) (60464f65)
* Support github timeline events. (1302) (732fd26a)
* Update link to GitHub Enterprise in README (1324) (e1537f79)
* Cleanup travis config (1322) (8189a538)
* Add support for update branch  (1317) (baddb719)
* Refactor Logging tests (1315) (b0ef1909)
* Fix rtd build (b797cac0)
* Add .git-blame-ignore-revs (573c674b)
* Apply black to whole codebase (1303) (6ceb9e9a)
* Fix class used returning pull request comments (1307) (f8e33620)
* Support for create_fork (1306) (2ad51f35)
* Use Repository.get_contents() in tests (1301) (e40768e0)
* Allow GithubObject.update() to be passed headers (1300) (989b635e)
* Correct URL for assignees on PRs (1296) (3170cafc)
* Use inclusive ordered comparison for 'parameterized' requirement (1281) (fb19d2f2)
* Deprecate Repository.get_dir_contents() (1285) (21e89ff1)
* Apply some polish to manage.sh (1284) (3a723252)

Links

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

[codecov]

Codecov Report

Merging #1147 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1147   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files          12      12           
  Lines         688     688           
  Branches       21      21           
======================================
  Hits          688     688

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