bigone PEP8 cleanup

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1.17.208

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kraken propagate fetchBalance params to sign()

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Fix key error exception in GDAX transaction parsing in some cases.

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bitfinex, hitbtc2 passthrough params in fetchBalance

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exx fetchOpenOrders / fetchOrder implicit method names fix

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cointiger parseTrade support for v2 format minor fixes

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cointiger fetchMyTrades exception error message minor edit

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Fix cointiger calling fetch_orders_by_status is not awaited

Fix cointiger unncessary parameters passed in parse_order

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Correct fee structure

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