Add myself as member (knative#297)

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of the Istio repos:
istio/istio.io#22051 (Merged)

org/istio.yaml

@@ -115,6 +115,7 @@ orgs:
     - knightXun
     - knrc
     - kramerul
+    - kramvan1
     - kyessenov
     - lambdai
     - ldemailly