V3 beta release announcement (#673)

README.md

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 [![Downloads][downloads-image]][downloads-url]
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fauth0%2Freact-native-auth0.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Fauth0%2Freact-native-auth0?ref=badge_shield)
 
+| Exciting news! We have just released React Native Auth0 v3 BETA, packed with powerful features and improvements. [Check out the release for more details](https://github.com/auth0/react-native-auth0/releases/tag/v3.0.0-beta.2) |
+| --- |
+
 📚 [Documentation](#documentation) • 🚀 [Getting Started](#getting-started) • ⏭️ [Next Steps](#next-steps) • ❓ [FAQs](https://github.com/auth0/react-native-auth0/blob/master/FAQ.md) • ❓ [Feedback](#feedback)
 
 ## Documentation