Call unlink rich menu from user API.

        https://developers.line.me/en/docs/messaging-api/reference/#unlink-rich-menu-from-user

        :param str user_id: ID of the user
        :param timeout: (optional) How long to wait for the server
            to send data before giving up, as a float,
            or a (connect timeout, read timeout) float tuple.
            Default is self.http_client.timeout
        :type timeout: float | tuple(float, float)

def unlink_rich_menu_from_user(self, user_id, timeout=None):
        """Call unlink rich menu from user API.

        https://developers.line.me/en/docs/messaging-api/reference/#unlink-rich-menu-from-user

        :param str user_id: ID of the user
        :param timeout: (optional) How long to wait for the server
            to send data before giving up, as a float,
            or a (connect timeout, read timeout) float tuple.
            Default is self.http_client.timeout
        :type timeout: float | tuple(float, float)
        """
        self._delete(
            '/v2/bot/user/{user_id}/richmenu'.format(user_id=user_id),
            timeout=timeout
        )