VOL-3501 Code changes to support rpc event

Change-Id: I8433b8fc925acbb23bce68091cea3a6b24fc9d85
diff --git a/go.mod b/go.mod
index 78de139..a3bdf52 100644
--- a/go.mod
+++ b/go.mod
@@ -29,7 +29,7 @@
 	github.com/hashicorp/serf v0.8.4 // indirect
 	github.com/jcmturner/gofork v1.0.0 // indirect
 	github.com/onsi/gomega v1.4.2 // indirect
-	github.com/opencord/voltha-protos/v4 v4.0.2
+	github.com/opencord/voltha-protos/v4 v4.0.6
 	github.com/opentracing/opentracing-go v1.1.0
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 	github.com/pierrec/lz4 v2.3.0+incompatible // indirect