chore(readme): remove beta warning now that we're in ga

Author: stainless-app[bot]

README.md

@@ -1,12 +1,5 @@
 # Orb C# API Library
 
-> [!NOTE]
-> The Orb C# API Library is currently in **beta** and we're excited for you to experiment with it!
->
-> This library has not yet been exhaustively tested in production environments and may be missing some features you'd expect in a stable release. As we continue development, there may be breaking changes that require updates to your code.
->
-> **We'd love your feedback!** Please share any suggestions, bug reports, feature requests, or general thoughts by [filing an issue](https://www.github.com/orbcorp/orb-csharp/issues/new).
-
 The Orb C# SDK provides convenient access to the [Orb REST API](https://docs.withorb.com/reference/api-reference) from applications written in C#.
 
 The REST API documentation can be found on [docs.withorb.com](https://docs.withorb.com/reference/api-reference).