code: func (s *TeamsService) DeleteTeam(ctx context.Context, team int64) (*Response, error) {
  	u := fmt.Sprintf("teams/%v", team)
  	req, err := s.client.NewRequest("DELETE", u, nil)
  	if err != nil {
  		return nil, err
  	}
  
  	req.Header.Set("Accept", mediaTypeNestedTeamsPreview)
  
  	return s.client.Do(ctx, req, nil)
  }
docs: // DeleteTeam deletes a team.
  //
  // GitHub API docs: https://developer.github.com/v3/teams/#delete-team