Moving all references to proto v4

Change-Id: Idbb9119da7ddae136f7ffbbb783429c7e049b3ab
diff --git a/protos/voltha_protos/voltha.proto b/protos/voltha_protos/voltha.proto
index ca9eca5..c2d5459 100644
--- a/protos/voltha_protos/voltha.proto
+++ b/protos/voltha_protos/voltha.proto
@@ -6,7 +6,7 @@
 
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-protos/v3/go/voltha";
+option go_package = "github.com/opencord/voltha-protos/v4/go/voltha";
 
 package voltha;