Update k8s dashboard yaml link.

The link before is not functioning anymore, update with new one.

Author: Aiden

addons/dashboard.md

@@ -3,7 +3,7 @@
 Kubernetes Dashboard 的部署非常简单，只需要运行
 
 ```sh
-kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml
+kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
 ```
 
 稍等一会，dashborad 就会创建好

appendix/play-with-k8s.md

@@ -73,7 +73,7 @@ kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$
 ## 创建Dashboard
 
 ```sh
-curl -L -s https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml  | sed 's/targetPort: 9090/targetPort: 9090\n  type: LoadBalancer/' | kubectl apply -f -
+curl -L -s https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml  | sed 's/targetPort: 9090/targetPort: 9090\n  type: LoadBalancer/' | kubectl apply -f -
 ```
 
 稍等一会，在页面上方会显示Dashborad服务的端口号，点击端口号就可以访问Dashboard页面。

en/addons/dashboard.md

@@ -3,7 +3,7 @@
 Kubernetes Dashboard 的部署非常简单，只需要运行
 
 ```sh
-kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml
+kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
 ```
 
 稍等一会，dashborad 就会创建好

introduction/cluster.md

@@ -53,7 +53,7 @@ Play with Kubernetes 有个非常方便的功能：自动在页面上显示所
 
 ```sh
 # 在 master node 上面运行
-kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml
+kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
 kubectl proxy --address='0.0.0.0' --port=8080 --accept-hosts='^*$'&
 ```