Fix help message of update_issues
Merge pull request #1 from danjo-m/fix_help_message

Fix help message of update_issues
Implement get_team_members command
Merge pull request #4 from okada-takuya/okada/team_members

Implement get_team_members command
Implement add_collaborator command
Merge pull request #2 from okada-takuya/okada/add_collaborators

Implement add_collaborator command
Extend octokit to leave a body of issue