feat: update changelog

Removed two feature entries from the unreleased section.

Author: SoulPancake

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Changelog
 
 ## [Unreleased](https://github.com/openfga/java-sdk/compare/v0.9.2...HEAD)
-- feat: Add `streamedListObjects` API endpoint with consumer callback support (#252)
+- feat: Improve error messaging by parsing error details from resp bodies (#256)
 
 ## v0.9.2