Implement GET /api/v3/account/commission

[p0mvn]

Please see:
https://developers.binance.com/docs/binance-spot-api-docs/rest-api/account-endpoints#query-commission-rates-user_data

Thank you

[xyq-c-cpp]

got it, but it's very great if you could push an PR of implementing this. @p0mvn

[carlosmiei]

Hello @p0mvn, @xyq-c-cpp I will try to add that soon. Thanks for the report.