Update CHANGELOG.md

Co-authored-by: Ben Purinton <ben.purinton@gmail.com>

Author: raghubetina

CHANGELOG.md

@@ -49,7 +49,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **Automatic conversation management**: The gem now automatically creates and manages conversations via OpenAI's Conversations API. The `conversation_id` is set after the first `generate!` call and maintained across subsequent calls.
 
-- **`get_items` method**: Retrieve all conversation items (messages, tool calls, reasoning) from OpenAI's API with `chat.get_items`.
+- **`items` method**: Retrieve all conversation items (messages, tool calls, reasoning) from OpenAI's API with `chat.items`.
 
 - **Improved test coverage**: Added integration tests for conversation continuity, file handling, and conversation items retrieval.