Fix accessing Mime types in specs. Following rails 5 deprecation of accessing MIME types via constant.
Fix accessing Mime types in specs.
Following rails 5 deprecation of accessing MIME types via constant.

jsonapi-suite/jsonapi_compliable,jsonapi-suite/jsonapi_compliable,richmolj/jsonapi_compliable,jsonapi-suite/jsonapi_suite,jsonapi-suite/jsonapi_suite,richmolj/jsonapi_compliable,jsonapi-suite/jsonapi_suite,jsonapi-suite/jsonapi_compliable,richmolj/jsonapi_compliable