Bittrex lags in returning active orders

Issue #501 resolved
Desrever Nu created an issue

Considering the results of the tests reported here -> https://docs.google.com/document/d/1lTakyiFxBIUPVxj09zW3AWU16K64TnySlgRv-zRamXE/edit

we either need to wait for them to improve their API side, or adapt nubot and introduce forced sleeps in the logic, specific to BITTREx