updated compatibility matrix in README

Author: yliaog

README.md

@@ -99,7 +99,7 @@ supported versions of Kubernetes clusters.
 - [client 27.y.z](https://pypi.org/project/kubernetes/27.2.0/): Kubernetes 1.26 or below (+-), Kubernetes 1.27 (✓), Kubernetes 1.28 or above (+-)
 - [client 28.y.z](https://pypi.org/project/kubernetes/28.1.0/): Kubernetes 1.27 or below (+-), Kubernetes 1.28 (✓), Kubernetes 1.29 or above (+-)
 - [client 29.y.z](https://pypi.org/project/kubernetes/29.0.0/): Kubernetes 1.28 or below (+-), Kubernetes 1.29 (✓), Kubernetes 1.30 or above (+-)
-- [client 30.y.z](https://pypi.org/project/kubernetes/30.1.0a1/): Kubernetes 1.29 or below (+-), Kubernetes 1.30 (✓), Kubernetes 1.31 or above (+-)
+- [client 30.y.z](https://pypi.org/project/kubernetes/30.1.0b1/): Kubernetes 1.29 or below (+-), Kubernetes 1.30 (✓), Kubernetes 1.31 or above (+-)
 
 
 > See [here](#homogenizing-the-kubernetes-python-client-versions) for an explanation of why there is no v13-v16 release.