Add a rating (vote and/or comment) to the lot with given identifier
        :param id: Identifier to add the rating to
        :param comment: String with the comment to add. It should have len > 0 when entered.
        :param vote: int with the vote to add. It should be greater than 0 and smaller than 4 when entered.
        :return: Which elements were uploaded (list of 'rating' and/or 'comment')
        :rtype: list

def rate(self, id, comment=None, vote=None):
        """
        Add a rating (vote and/or comment) to the lot with given identifier
        :param id: Identifier to add the rating to
        :param comment: String with the comment to add. It should have len > 0 when entered.
        :param vote: int with the vote to add. It should be greater than 0 and smaller than 4 when entered.
        :return: Which elements were uploaded (list of 'rating' and/or 'comment')
        :rtype: list
        """

        rating = {}

        if vote is not None:
            if 1 <= vote <= 3:
                rating['rating'] = vote
        if comment is not None:
            if len(comment) > 0:
                rating['comment'] = comment

        url = self._base + 'lot/{0}/comment'.format(id)
        r = requests.post(url, auth=self._auth, params=rating)
        r.raise_for_status()
        return r.json()