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

Change-Id: I32074b5c05b08f8ebd2205f8dc2af225bff465cc
diff --git a/rw_core/main.go b/rw_core/main.go
index 35472e5..a3af416 100644
--- a/rw_core/main.go
+++ b/rw_core/main.go
@@ -27,9 +27,9 @@
 	"github.com/opencord/voltha-go/rw_core/config"
 	c "github.com/opencord/voltha-go/rw_core/core"
 	"github.com/opencord/voltha-go/rw_core/utils"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-lib-go/v3/pkg/probe"
-	"github.com/opencord/voltha-lib-go/v3/pkg/version"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/probe"
+	"github.com/opencord/voltha-lib-go/v4/pkg/version"
 )
 
 func waitForExit(ctx context.Context) int {