Add functions for futures rateLimit#554

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clcreuso wants to merge 3 commits intoccxt:masterfrom

clcreuso:master

Commits on Jan 5, 2021

[UPDATE] usless variable futuresInfo, add 2 params for usedWeight and orderCount
clcreuso
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[ADD] usedWeight and orderCount when we have a futures respond
clcreuso
committed
[ADD] futures fonction for get weight and order count
clcreuso
committed