client = BacklogClient("your_space_name", "your_api_key")
        client.user_stars_count(5)
        client.user_stars_count(5, {"since": "2017-05-01", "until": "2017-05-31"})

def user_stars_count(self, user_id, extra_query_params={}):
        """
        client = BacklogClient("your_space_name", "your_api_key")
        client.user_stars_count(5)
        client.user_stars_count(5, {"since": "2017-05-01", "until": "2017-05-31"})
        """
        return self.do("GET", "users/{user_id}/stars/count",
                       url_params={"user_id": user_id},
                       query_params=extra_query_params)