Send a request for auction history info, return the response.

        Arguments:
        symbol -- currency symbol (default 'btcusd')
        since -- only return auction events after this timestamp (default 0)
        limit_auction_results -- maximum number of auction events to return
                                 (default 50).
        include_indicative -- whether to include publication of indicative
                              prices and quantities. (default True)

def auction_history(self, symbol='btcusd', since=0,
                        limit_auction_results=50, include_indicative=1):
        """
        Send a request for auction history info, return the response.

        Arguments:
        symbol -- currency symbol (default 'btcusd')
        since -- only return auction events after this timestamp (default 0)
        limit_auction_results -- maximum number of auction events to return
                                 (default 50).
        include_indicative -- whether to include publication of indicative
                              prices and quantities. (default True)
        """
        url = self.base_url + '/v1/auction/' + symbol + '/history'
        params = {
            'since': since,
            'limit_auction_results': limit_auction_results,
            'include_indicative': include_indicative
        }

        return requests.get(url, params)