v4.0.0

What's Changed

• chore: clean up eslint rules by @charlesfries in #301
• feat: add test for serializer extractRelationships method by @charlesfries in #300
• chore: support ember-simple-auth v6 by @charlesfries in #304
• chore: update ember-cli-fastboot to v4 by @charlesfries in #291
• fix!: export AdapterRecordNotFoundError as default by @charlesfries in #306

Full Changelog: v3.2.4...v4.0.0