Now that GitHub have moved their documentation from
developer.github.com, we should update our links. I have also tried to
update the call strings to their new format, but since it was done via
regex, some of them may not match exactly.
* Add CheckRun object and stub file
* Add list of check runs endpoint for Commit
* Add get check run endpoint for Repository
* Add CheckRun test file and replay data files
* Add CheckRunAnnotation object and stub file
* Add create CheckRun API endpoint to Repository
* Update and add new tests for CheckRun endpoint: