Updates an article

        :param article_id: the article id
        :param article_dict: dict
        :return: dict

def update_article(self, article_id, article_dict):
        """
        Updates an article

        :param article_id: the article id
        :param article_dict: dict
        :return: dict
        """
        return self._create_put_request(resource=ARTICLES, billomat_id=article_id, send_data=article_dict)