Adding attributes "maintain" and "triage" to class "Permissions"

[karsten-wagner]

Addresses feature request in #1809

• Added attribute maintain to class Permissions
• Added attribute triage to class Permissions
• Verified documentation build covers the new attributes
• Verified Github API response on team permissions is properly reflected in updated class
• Linting successful

Fixes #1809

[karsten-wagner]

The code coverage report does not seem to consider all files in the github folder. It's not really clear to me why test coverage should be lower based on my recent change than before. Please advise how to read that report and how to ensure code coverage remains at least on same level?!

[codecov-io]

Codecov Report

Merging #1810 (68a0e16) into master (34d097c) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1810      +/-   ##
==========================================
- Coverage   98.76%   98.75%   -0.02%     
==========================================
  Files          51       50       -1     
  Lines        2677     2653      -24     
==========================================
- Hits         2644     2620      -24     
  Misses         33       33              

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[karsten-wagner]

I believe this would need #1813 to fix the code coverage calculation issue mentioned before.