code: public OkCoinFutureComment getFuturePriceLimit(
        CurrencyPair currencyPair, FuturesContract contractType) throws IOException {
      return okCoin.getFuturePriceLimit(
          "1", OkCoinAdapters.adaptSymbol(currencyPair), contractType.getName());
    }
docs: 获取合约最高限价和最低限价
  
  @param currencyPair
  @param contractType
  @return
  @throws IOException