Updates a client

        :param client_id: the client id
        :param client_dict: dict
        :return: dict

def update_client(self, client_id, client_dict):
        """
        Updates a client

        :param client_id: the client id
        :param client_dict: dict
        :return: dict
        """
        return self._create_put_request(
            resource=CLIENTS,
            billomat_id=client_id,
            send_data=client_dict
        )