Add GKE into list of support tests (#597)

Also adds links to the Kubernetes benchmarks

Fixes #596

README.md

@@ -43,21 +43,17 @@ Table of Contents
       
 ## CIS Kubernetes Benchmark support
 
-kube-bench supports the tests for Kubernetes as defined in the CIS Benchmarks 1.3.0 to 1.5.0 respectively. 
+kube-bench supports the tests for Kubernetes as defined in the [CIS Kubernetes Benchmarks](https://www.cisecurity.org/benchmark/kubernetes/). 
 
 | CIS Kubernetes Benchmark | kube-bench config | Kubernetes versions |
 |---|---|---|
-| 1.3.0| cis-1.3 | 1.11-1.12 |
-| 1.4.1| cis-1.4 | 1.13-1.14 |
-| 1.5.0 | cis-1.5 | 1.15- |
-
-
-By default, kube-bench will determine the test set to run based on the Kubernetes version running on the machine.
-
-kube-bench has preliminary support for Red Hat's OpenShift Hardening Guide for 3.10 and 3.11.
-There is also preliminary support for Google's Kubernetes Engine starting from Kubernetes 1.15.
-Please note that kube-bench does not automatically detect OpenShift and GKE - see below. 
+| [1.3.0](https://workbench.cisecurity.org/benchmarks/602) | cis-1.3 | 1.11-1.12 |
+| [1.4.1](https://workbench.cisecurity.org/benchmarks/2351) | cis-1.4 | 1.13-1.14 |
+| [1.5.0](https://workbench.cisecurity.org/benchmarks/1370) | cis-1.5 | 1.15- |
+| [GKE 1.0.0](https://workbench.cisecurity.org/benchmarks/4536) | gke-1.0 | GKE |
+| Red Hat OpenShift hardening guide | rh-0.7 | OCP 3.10-3.11 | 
 
+By default, kube-bench will determine the test set to run based on the Kubernetes version running on the machine, but please note that kube-bench does not automatically detect OpenShift and GKE - see the section below on [Running kube-bench](https://github.com/aquasecurity/kube-bench#running-kube-bench). 
 
 ## Installation