update README on kubectl krew update

clusternet · Sep 8, 2021 · 104e46b · 104e46b
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diff --git a/README.md b/README.md
@@ -17,7 +17,19 @@ please [install Krew with this guide](https://krew.sigs.k8s.io/docs/user-guide/s
 Then you can install `Clusternet` kubectl plugin with,
 
 ```bash
+$ kubectl krew update
 $ kubectl krew install clusternet
+# check plugin version
+$ kubectl clusternet version
+```
+
+or update existing `Clusternet` plugin to latest,
+
+```bash
+$ kubectl krew update
+$ kubectl krew upgrade clusternet
+# check plugin version
+$ kubectl clusternet version
 ```
 
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