feat: .actions.downloadWorkflowRunAttemptLogs(), .actions.getWorkflowRunAttempt(), .repos.generateReleaseNotes(), .checks.rerequestRun(). Graduate nebula, zzzax, switcheroo, baptiste previews. Removes defunkt /repos/{owner}/{repo}/actions/runs/{run_id}/retry endpoint. Renames methods to have consistent AuthenticatedUser() suffix, deprecates previous method names (#125)

Author: gr2m