update README.md (#11)

README.md

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 Supadantic is a small Python library that allows you to manage [Supabase](supabase.com) tables through [Pydantic](https://github.com/pydantic/pydantic) models. It is very convenient to use in projects based on [FastAPI](https://github.com/tiangolo/fastapi), [Flask](https://github.com/pallets/flask), and so on.
 
 
+## Important information
+Supadantic may not have backward compatibility until version `0.1.0`. This is because the library is still experimental and is being used in several of my other projects, where requirements are still being finalized.
+
+
 ## Installation
 
 Install using `pip install -U pydantic`.