Moving all references to proto v4

Change-Id: Idbb9119da7ddae136f7ffbbb783429c7e049b3ab
diff --git a/protos/voltha_protos/omci_mib_db.proto b/protos/voltha_protos/omci_mib_db.proto
index 9c3c48c..b742db3 100644
--- a/protos/voltha_protos/omci_mib_db.proto
+++ b/protos/voltha_protos/omci_mib_db.proto
@@ -15,7 +15,7 @@
 //
 syntax = "proto3";
 
-option go_package = "github.com/opencord/voltha-protos/v3/go/omci";
+option go_package = "github.com/opencord/voltha-protos/v4/go/omci";
 option java_package = "org.opencord.voltha.omci";
 
 package omci;