Updated CHANGELOG.md to link to the beta release

Author: pmathew92

CHANGELOG.md

@@ -4,6 +4,7 @@
 [Full Changelog](https://github.com/auth0/Auth0.Android/compare/2.11.0...3.0.0)
 
 Check the [Migration Guide](https://github.com/auth0/Auth0.Android/blob/main/V3_MIGRATION_GUIDE.md) to understand the changes required to migrate your application to v3
+Check the [3.0.0.beta.0][https://github.com/auth0/Auth0.Android/releases/tag/3.0.0-beta.0] to understand other major changes
 
 **⚠️ BREAKING CHANGES**
 - BREAKING CHANGE: updated description of AuthenticationException in case of empty description [\#756](https://github.com/auth0/Auth0.Android/pull/756) ([desusai7](https://github.com/desusai7))