Change Kubernetes version in command return

docs/10-configuring-kubectl.md

@@ -57,10 +57,10 @@ kubectl get nodes
 > Output:
 
 ```bash
-NAME       STATUS   ROLES    AGE    VERSION
-worker-0   Ready    <none>   2m9s   v1.15.3
-worker-1   Ready    <none>   2m9s   v1.15.3
-worker-2   Ready    <none>   2m9s   v1.15.3
+NAME       STATUS   ROLES    AGE   VERSION
+worker-0   Ready    <none>   90s   v1.18.4
+worker-1   Ready    <none>   91s   v1.18.4
+worker-2   Ready    <none>   90s   v1.18.4
 ```
 
 Next: [Provisioning Pod Network Routes](11-pod-network-routes.md)