code: public OkCoinTickerResponse getFuturesTicker(CurrencyPair currencyPair, FuturesContract prompt)
        throws IOException {
      return okCoin.getFuturesTicker(OkCoinAdapters.adaptSymbol(currencyPair), prompt.getName());
    }
docs: 获取OKEx合约行情
  
  @param currencyPair
  @param prompt
  @return
  @throws IOException