[VOL-3665] Update voltha library to the latest

Change-Id: Ieae89b82488379da4b99ab7b7a5356990a8bcdd3
diff --git a/go.mod b/go.mod
index 85c3a6f..0401589 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@
 	github.com/gogo/protobuf v1.3.0
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
-	github.com/opencord/voltha-lib-go/v4 v4.0.0
+	github.com/opencord/voltha-lib-go/v4 v4.0.2
 	github.com/opencord/voltha-protos/v4 v4.0.2
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 	github.com/stretchr/testify v1.4.0