code: func (l *Lambda) UpdateAlias(in *lambda.UpdateAliasInput) (*lambda.AliasConfiguration, error) {
  	l.update("alias", *in.FunctionName, map[string]interface{}{
  		"alias":   *in.Name,
  		"version": *in.FunctionVersion,
  	})
  	return nil, nil
  }
docs: // UpdateAlias stub.