def user_stars(self, user_id, extra_query_params={}):
        """
        client = BacklogClient("your_space_name", "your_api_key")
        client.user_stars(5)
        client.user_stars(5, {"count": 100, "order": "asc"})
        """
        return self.do("GET", "users/{user_id}/stars",
                       url_params={"user_id": user_id},
                       query_params=extra_query_params)