Update README.md for new release & URL (kubernetes#4702)

ref kubernetes#4701

README.md

@@ -17,7 +17,7 @@ Kubernetes Dashboard is a general purpose, web-based UI for Kubernetes clusters.
 To deploy Dashboard, execute following command:
 
 ```sh
-$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
+$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml
 ```
 
 To access Dashboard from your local workstation you must create a secure channel to your Kubernetes cluster. Run the following command:
@@ -27,8 +27,8 @@ $ kubectl proxy
 ```
 Now access Dashboard at:
 
-[`http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/`](
-http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/).
+[`http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/`](
+http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/).
 
 ## Create An Authentication Token (RBAC)
 To find out how to create sample user and log in follow [Creating sample user](docs/user/access-control/creating-sample-user.md) guide.