Changes to Managed sub-account asset details(For Investor Master Account)

for the query request parameter recvWindow, the format changed from no format to int64

for the query request parameter timestamp, the format changed from no format to int64

the response property code became required for the status 400

the response property code became required for the status 401

the response property items/availableBalance became required for the status 200

the response property items/btcValue became required for the status 200

the response property items/coin became required for the status 200

the response property items/inOrder became required for the status 200

the response property items/name became required for the status 200

the response property items/totalBalance became required for the status 200

the response property msg became required for the status 400

the response property msg became required for the status 401