code: func (s *MigrationService) MigrationStatus(ctx context.Context, org string, id int64) (*Migration, *Response, error) {
  	u := fmt.Sprintf("orgs/%v/migrations/%v", org, id)
  
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept header when this API fully launches.
  	req.Header.Set("Accept", mediaTypeMigrationsPreview)
  
  	m := &Migration{}
  	resp, err := s.client.Do(ctx, req, m)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return m, resp, nil
  }
docs: // MigrationStatus gets the status of a specific migration archive.
  // id is the migration ID.
  //
  // GitHub API docs: https://developer.github.com/v3/migration/migrations/#get-the-status-of-a-migration