Send a request to get the public order book, return the response.

        Arguments:
        symbol -- currency symbol (default 'btcusd')
        limit_bids -- limit the number of bids returned (default 0)
        limit_asks -- limit the number of asks returned (default 0)

def book(self, symbol='btcusd', limit_bids=0, limit_asks=0):
        """
        Send a request to get the public order book, return the response.

        Arguments:
        symbol -- currency symbol (default 'btcusd')
        limit_bids -- limit the number of bids returned (default 0)
        limit_asks -- limit the number of asks returned (default 0)
        """
        url = self.base_url + '/v1/book/' + symbol
        params = {
            'limit_bids': limit_bids,
            'limit_asks': limit_asks
        }

        return requests.get(url, params)