docs: def fetch_logins(roles, repo):
      """Fetch logins for users with given roles.
      """
      users = set()
      if 'stargazer' in roles:
          printmp('Fetching stargazers')
          users |= set(repo.stargazers())
      if 'collaborator' in roles:
          printmp('Fetching collaborators')
          users |= set(repo.collaborators())
      if 'issue' in roles:
          printmp('Fetching issues creators')
          users |= set([i.user for i in repo.issues(state='all')])
      return users