code: func (s *ProjectsService) GetProjectColumn(ctx context.Context, id int64) (*ProjectColumn, *Response, error) {
  	u := fmt.Sprintf("projects/columns/%v", id)
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept headers when APIs fully launch.
  	req.Header.Set("Accept", mediaTypeProjectsPreview)
  
  	column := &ProjectColumn{}
  	resp, err := s.client.Do(ctx, req, column)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return column, resp, nil
  }
docs: // GetProjectColumn gets a column of a GitHub Project for a repo.
  //
  // GitHub API docs: https://developer.github.com/v3/projects/columns/#get-a-project-column