Deletes the cells associated with the range.
        :param str shift: Optional. Specifies which way to shift the cells.
         The possible values are: up, left.

def delete(self, shift='up'):
        """
        Deletes the cells associated with the range.
        :param str shift: Optional. Specifies which way to shift the cells.
         The possible values are: up, left.
        """
        url = self.build_url(self._endpoints.get('delete_range'))
        return bool(self.session.post(url, data={'shift': shift.capitalize()}))