Update README.md

README.md

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 # Metronome Go API Library
 
+> [!WARNING]
+> This is prerelease software that is not ready for production use. There may be bugs and
+> there will be breaking changes version to version. Use at your own risk.
+
 <a href="https://pkg.go.dev/github.com/Metronome-Industries/metronome-go"><img src="https://pkg.go.dev/badge/github.com/Metronome-Industries/metronome-go.svg" alt="Go Reference"></a>
 
 The Metronome Go library provides convenient access to [the Metronome REST
 API](https://docs.metronome.com) from applications written in Go. The full API of this library can be found in [api.md](api.md).
 
-It is generated with [Stainless](https://www.stainlessapi.com/).
-
 ## Installation
 
 <!-- x-release-please-start-version -->