Merge pull request #191 from andyxning/update_client-go_version_in_re…

…adme

update client-go version in readme

README.md

@@ -21,7 +21,7 @@ Kubernetes clusters. The supported Kubernetes cluster version is determined by `
 The compatibility matrix for client-go and Kubernetes cluster can be found 
 [here](https://github.com/kubernetes/client-go#compatibility-matrix). 
 All additional compatibility is only best effort, or happens to still/already be supported.
-Currently, `client-go` is in version `v2.0.0-alpha.1`.
+Currently, `client-go` is in version `v4.0.0-beta.0`.
 
 ## Container Image