Balena-sdk

* Typings: Allow numeric parameters to models.application.has() 570 [Thodoris Greasidis]
* Update logs tests to match the new API subscribe behaviour 570 [Tim Perry]

* Update test command in readme 565 [Aga Domanska]

* Fix bug in log stream setup error reporting 560 [Tim Perry]

* Typings: Properly type User to Application navigation 562 [Thodoris Greasidis]

* Restore disabled key generation tests for not found app/device 558 [Thodoris Greasidis]

* Update docs [Trong Nghia Nguyen]
* Add python v3.7 and v3.8 to travis.yml [Trong Nghia Nguyen]
* Update tests to support orgs model [Trong Nghia Nguyen]
* Update release.create_from_url() to support orgs model [Trong Nghia Nguyen]
* **BREAKING** Change the device_type of all models to resource references [Trong Nghia Nguyen]
* **BREAKING** Change application and device commit to release references [Trong Nghia Nguyen]
* Clarify that application.get_by_owner now accepts organization handles [Trong Nghia Nguyen]
* **BREAKING** Require an organization when creating applications [Trong Nghia Nguyen]
* Add methods for the organization model [Trong Nghia Nguyen]
* **BREAKING** Add support for the v6 orgs model [Trong Nghia Nguyen]