Merge the range cells into one region in the worksheet.
        :param bool across: Optional. Set True to merge cells in each row of the
         specified range as separate merged cells.

def merge(self, across=False):
        """
        Merge the range cells into one region in the worksheet.
        :param bool across: Optional. Set True to merge cells in each row of the
         specified range as separate merged cells.
        """
        url = self.build_url(self._endpoints.get('merge_range'))
        return bool(self.session.post(url, data={'across': across}))