v1.9.0: 🐙 feat(order): kraken 🐙 (#213)

* add basic kraken implementation

* more progress

* done?

* add tests and wrap up

* typo

* safeguards

* init defaults

* version test

* get json response

* edit test volume

* finalizing

* fix std issues

* lint

* fix test

* change spend_ratio for test