8.2.2

Removed Abucoins and Urdubit.
Renamed OKEx to OKX.
Renamed Bithumb Pro to Biglobal.
Added BitMart, Digifinex, Hoo, Mexc, XT.com, and Yadio exchanges.
Improve error handling when downloading new coin list.
Fixed a bug where the selected coin would appear in the currencies list (e.g. BTC/BTC).