Return all stop times in the date range

        :param start_date:
            The starting date for the query.
        :param end_date:
            The end date for the query.
        >>> import datetime
        >>> today = datetime.date.today()
        >>> trans.stoptimes(today - datetime.timedelta(days=1), today)

def stoptimes(self, start_date, end_date):
        """Return all stop times in the date range

        :param start_date:
            The starting date for the query.
        :param end_date:
            The end date for the query.
        >>> import datetime
        >>> today = datetime.date.today()
        >>> trans.stoptimes(today - datetime.timedelta(days=1), today)
        """
        params = {
            'start': self.format_date(start_date),
            'end': self.format_date(end_date)
        }
        response = self._request(ENDPOINTS['STOPTIMES'], params)
        return response