As the project has been renamed, its better to reflect it in the source
code as well.
JSONAPI::Serializer is evaluated from FastJsonapi::ObjectSerializer so
this change probably will go unnoticed in gem usage.
This change alters the cache namespace prior to retrieving cached record
data to ensure that different fieldsets are given different cache keys.
Previously, all cache keys for the same record would be specified
identically, leading to a situation where the fieldset would be ignored
if record caching is enabled.
Fixes#90.
* chore(tests): add missing test for relationships belongs_to polymorphic type definitions
* chore(tests): add missing test for relationships belongs_to polymorphic type definitions
* linting
