release 6.57.0

release 6.45.0

release 6.34.0

add transfer id and sub account cross margin balances

porfolio margin account support

flash swap api; missing fields in futures auto order; wallet sub acco…

…unt balances

support futures order amendment; spot candles suport 30d

futures delivery candlesticks support more intervals

add withdrawl and deposit fee; add spot currency fixed rate

spot order add fok support