task: add to unreleased changelog pull 378

Author: randyv12

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 
 ## Unreleased
+- [378](https://github.com/JsonApiClient/json_api_client/pull/378) - Add the ability to create a subclass of JsonApiClient::Resource to have a modified id method
 
 ## 1.21.0
 - [#395](https://github.com/JsonApiClient/json_api_client/pull/395) - relaxing faraday dependency to anything less than 2.0