code: func (s *MigrationService) ListUserMigrations(ctx context.Context) ([]*UserMigration, *Response, error) {
  	u := "user/migrations"
  
  	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)
  
  	var m []*UserMigration
  	resp, err := s.client.Do(ctx, req, &m)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return m, resp, nil
  }
docs: // ListUserMigrations lists the most recent migrations.
  //
  // GitHub API docs: https://developer.github.com/v3/migrations/users/#get-a-list-of-user-migrations