v0.7.2

Changes

🚀 Features

• BitMEX: added Position websocket @jacobjthompson (#533)
• Digifinex: API improvements @szmcdull (#531)
• BitMEX: added support for amending orders in bulk @jacobjthompson (#532)
• BTSE: added some private REST endpoints @Kukks (#529)
• BitMEX: added new private methods @jacobjthompson (#528)

🐛 Bug Fixes

• NDAX: fix Trades websocket @vslee (#534)