Pyokx

Updated to new API spec.
Fixed methods that took request body as list to accept a generic list argument

Minor function description updated based on new API spec and reordering of some kwargs to also fit the API spec

Some breaking changes owing to change in spec on the OKX API.

pyokx
Minor function description updates and missing optional kwargs for following functions:

Publicdata -> get_position_tiers -> ccy: str
Trade -> place_algo_order, get_algo_order_list -> clOrdId: str


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