[zh]: add missing context module for the go example

The client-go example is missing the param context.
This patch adds the missing param.

Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>

content/zh/docs/tasks/administer-cluster/access-cluster-api.md

@@ -280,6 +280,7 @@ Go 客户端可以使用与 kubectl 命令行工具相同的
 package main
 
 import (
+   "context"
    "fmt"
    "k8s.io/client-go/1.4/kubernetes"
    "k8s.io/client-go/1.4/pkg/api/v1"
@@ -293,7 +294,7 @@ func main() {
   // creates the clientset
   clientset, _ := kubernetes.NewForConfig(config)
   // access the API to list pods
-  pods, _ := clientset.CoreV1().Pods("").List(v1.ListOptions{})
+  pods, _ := clientset.CoreV1().Pods("").List(context.TODO(), v1.ListOptions{})
   fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
 }
 ```