Update README to use `kubectl apply`
The sample actionset uses 'generateName` - which cannot be used
with `kubectl create -f`
@@ -122,7 +122,7 @@ blueprint "mongo-sidecar" created
You can now take a backup of MongoDB's data using an action set defining backup for this application:
```bash
-$ kubectl create -f ./examples/mongo-sidecar/backup-actionset.yaml
+$ kubectl apply -f ./examples/mongo-sidecar/backup-actionset.yaml
actionset "mongo-backup-12046" created
$ kubectl get actionsets.cr.kanister.io
