Added remove docker installed kubectl.

README.md

@@ -18,6 +18,17 @@ Docker CE Edge installer come with experimental features in Docker Engine enable
 
 Go [docker-for-mac Edge](https://download.docker.com/mac/edge/Docker.dmg) to install it. This tutorial is tested with Docker for Mac using Edge channel. 
 
+Docker for Mac Edge kubernetes integration installed `kubectl v.1.9` command in /usr/local/bin, which overrides what's installed in by brew. We need the latest `kubectl` 
+for some of the Kubernetes feature to work. Let's fix it and make sure `kubectl` version is 1.10.x:
+
+```console
+$ rm /usr/local/bin/kubectl 
+$ brew reinstlal kubectl
+$ kubectl version -c
+Flag shorthand -c has been deprecated, please use --client instead.
+Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.1", GitCommit:"d4ab47518836c750f9949b9e0d387f20fb92260b", GitTreeState:"clean", BuildDate:"2018-04-13T22:29:03Z", GoVersion:"go1.9.5", Compiler:"gc", Platform:"darwin/amd64"}
+```
+
 ## Enable the kubernetes cluster
 
 Click the `Docker` icon in the status bar, go to `Preferences`, and on the `Kubernetes` tab,  check *Enable Kubernetes*. This will start a single node Kubernetes cluster. This might take a while - have a cup of tea and wait for the Kubernetes cluster to be ready.