flake8 fixes
flake8 fixes

ccxt/ccxt,tritoanst/ccxt,thijstriemstra/ccxt,aiueogawa/ccxt,ccxt/ccxt,tritoanst/ccxt,ccxt/ccxt,thijstriemstra/ccxt,ccxt/ccxt,ccxt/ccxt,thijstriemstra/ccxt,aiueogawa/ccxt,tritoanst/ccxt,tritoanst/ccxt,aiueogawa/ccxt,thijstriemstra/ccxt,aiueogawa/ccxt