onboardDate is wrong for many perpetual futures #427
Description
inlcuding some important symbols like ETHUSDT, DOGEUSDT
data is obtained by following codes
BINANCE_FAPI_URL = "https://fapi.binance.com"
url = f"{BINANCE_FAPI_URL}/fapi/v1/exchangeInfo"
resp = requests.get(url)
data = resp.json()['symbols']