bump client badge from beta -> stable - for #726

Signed-off-by: clux <[email protected]>

kube-client/README.md

@@ -1,6 +1,6 @@
 # kube-client
 [![Client Capabilities](https://img.shields.io/badge/Kubernetes%20client-Silver-blue.svg?style=plastic&colorB=C0C0C0&colorA=306CE8)](https://github.com/kubernetes/design-proposals-archive/blob/main/api-machinery/csi-new-client-library-procedure.md#client-capabilities)
-[![Client Support Level](https://img.shields.io/badge/kubernetes%20client-beta-green.svg?style=plastic&colorA=306CE8)](https://github.com/kubernetes/design-proposals-archive/blob/main/api-machinery/csi-new-client-library-procedure.md#client-support-level)
+[![Client Support Level; Stable](https://img.shields.io/badge/kubernetes%20client-stable-green.svg?style=plastic&colorA=306CE8)](https://kube.rs/stability)
 
 The rust counterpart to [kubernetes/client-go](https://github.com/kubernetes/apimachinery).
 Contains the IO layer plus the core Api layer, and also as well as config parsing.