Add the undocumented (but used) check suite conclusion "skipped"

[JeffreyPalmer]

Hello!

There is currently an undocumented check suite conclusion ("skipped") that exists in the wild (see https://github.community/t5/GitHub-API-Development-and/Is-quot-skipped-quot-now-a-valid-check-suite-conclusion/m-p/43980#M3900) that causes this library to throw an exception while attempting to load check suites with that conclusion. Since I can't seem to get an answer as to whether or not this has been added to the Checks API, I'm assuming that it has and that this is a documentation deficiency. I'm therefore submitting this trivial PR to add it. Unfortunately I don't think that I was able to run all of the tests (I'm not on Windows) - hope that's okay.

Additionally, do you have any plans to release another version soon? In addition to this issue, I would love to have access to the organization membership methods that were added two commits after v0.36.0. Thanks!

[codecov]

Codecov Report

Merging #2077 into master will not change coverage.
The diff coverage is n/a.

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##           master    #2077   +/-   ##
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  Coverage   67.06%   67.06%           
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  Files         538      538           
  Lines       14138    14138           
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  Hits         9481     9481           
  Misses       4657     4657

[shiftkey]

Thanks for the contribution!

Additionally, do you have any plans to release another version soon? In addition to this issue, I would love to have access to the organization membership methods that were added two commits after v0.36.0. Thanks!

This is on my list to do sometime in the next couple weeks - I just need a reliable working environment to publish releases and get the release notes written.

[shiftkey]

release_notes: add CheckConclusion.Skipped value to Conclusion property for CheckSuite and CheckRun