chore: update sdk readme

Author: tilyupo

packages/sdk/README.md

@@ -473,16 +473,10 @@ unsubscribeMaxUsers();
 replane.close();
 ```
 
-## Roadmap
-
-- Config caching
-- Config invalidation
-
 ## Community
 
 Have questions or want to discuss Replane? Join the conversation in [GitHub Discussions](https://github.com/orgs/replane-dev/discussions).
 
 ## License
 
 MIT
-