Update README.md

as per my other two requests, the 1.6.1 Kubernetes had a defect that was corrected in 1.7.0. I ran your code seamlessly using 1.7.0 today.
nileshmiskin · Jul 12, 2017 · adaa9fb · adaa9fb
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@@ -12,7 +12,7 @@ The target audience for this tutorial is someone planning to support a productio
 
 ## Cluster Details
 
-* Kubernetes 1.6.1
+* Kubernetes 1.7.0
 * Docker 1.12.6
 * etcd 3.1.4
 * [CNI Based Networking](https://github.com/containernetworking/cni)