Update README.md

Author: nhannah

README.md

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-## **Important Note**
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-Currently we are working on publishing v3.0.0. Its in beta phase (`v3.0.0-beta.2`) at the moment. For [v2.x.x](https://github.com/GetStream/stream-chat-react-native/releases/tag/v2.2.2) (stable), please follow the docs [here](https://github.com/GetStream/stream-chat-react-native/tree/v2-legacy)
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 # Official React Native SDK for [Stream Chat](https://getstream.io/chat/)
 
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