Update README.md

Note that custom function calling works now

Author: chriscarrollsmith

README.md

@@ -2,7 +2,7 @@
 
 A quick-start template using the OpenAI [Assistants API](https://platform.openai.com/docs/assistants/overview) with [Python](https://www.python.org/), [Jinja2](https://jinja.palletsprojects.com/en/3.1.x/), and [FastAPI](https://fastapi.tiangolo.com/).
 
-**Note:** This repository is still under construction; only basic chat is currently functional.
+**Note:** This repository is still under construction; only basic chat and custom function calling are currently functional.
 
 ## Quickstart Setup