bittrex canceled status close ccxt#4974 [ci skip]
itbit added ETH markets fix ccxt#4970 [ci skip]
Fix links Bit-Z [ci skip]
1.18.455 [ci skip] [ci skip]
mercado use safeFloat / safeInteger in parseOHLCV [ci skip]
livecoin fetchMyTrades() true [ci skip]
formatting edits in CONTRIBUTING [ci skip]
kucoin withdraw fix ccxt#4957 [ci skip]
minor linting issue [ci skip]
fixes ccxt#4954 (kucoin zero priced market orders) [ci skip]