Release 0.0.4

1. Add the /clearconversationhistory command, thanks to [@ryantsai](https://github.com/ryantsai]
   When a user enters it on LINE, it will clear the session storage, and the next message sent to Dify will start a brand-new, clean session.
2. Image message handling, thanks to [@ryantsai](https://github.com/ryantsai]
   Generate responses based on the uploaded images.
3. Message Handling Enhancement, thanks to [@ryantsai](https://github.com/ryantsai]
   Added support for Markdown image URLs. [url](http://xxx.xxx)
4. Handle image content in responses[@ryantsai](https://github.com/ryantsai]
   Ensure that generated images are properly displayed on LINE.
5. Identifier Retrieval Support, thanks to [@jimcchi](https://github.com/jimcchi]
   Capture user_id, room_id, and group_id from incoming messages.