0.4

Adds

Adds a service to update Accessions in Aurora, #74

Fixes

Returns consistently structured responses from services, including message and identifiers of objects acted on, #58
Correctly overrides Django Rest Framework templates, #62
Uses Django Rest Framework's native OpenAPI schema view, #61
Refactors tests and clients to remove redundant code, #75
Removes structlog and other unused dependencies

Deployment notes

Removes some dependencies
Updates dependencies