code: func NewScanStringHandler(s *string) ReplyHandler {
  	return func(reply interface{}) error {
  		var err error
  		(*s), err = redis.String(reply, nil)
  		if err != nil {
  			return err
  		}
  		return nil
  	}
  }
docs: // NewScanStringHandler returns a ReplyHandler which will convert the reply to
  // a string and set the value of i to the converted string. The ReplyHandler
  // will return an error if there was a problem converting the reply.