Merge pull request #4898 from karenhchu/patch-2

Add slack channels for krustlet

Author: k8s-ci-robot

communication/slack-config/channels.yaml

@@ -152,6 +152,7 @@ channels:
   - name: krane
   - name: krew
   - name: krex
+  - name: krustlet  
   - name: kube-aws
   - name: kube-deploy
     archived: true