VOL-3589 Update voltha go to support new version v4 of voltha protos

Change-Id: I32074b5c05b08f8ebd2205f8dc2af225bff465cc
diff --git a/rw_core/mocks/adapter_test.go b/rw_core/mocks/adapter_test.go
index f748ea9..5a6af53 100644
--- a/rw_core/mocks/adapter_test.go
+++ b/rw_core/mocks/adapter_test.go
@@ -17,7 +17,7 @@
 package mocks
 
 import (
-	"github.com/opencord/voltha-lib-go/v3/pkg/adapters"
+	"github.com/opencord/voltha-lib-go/v4/pkg/adapters"
 	"testing"
 )