Update to omci-lib-go version 1.15.2

Change-Id: I383f643458f7edac5174408b5b3083afa6c584f6
diff --git a/go.mod b/go.mod
index 6cd9f23..ff9b3d0 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@
 	github.com/golang/protobuf v1.4.2
 	github.com/google/gopacket v1.1.17
 	github.com/looplab/fsm v0.1.0
-	github.com/opencord/omci-lib-go v0.15.0
+	github.com/opencord/omci-lib-go v0.15.2
 	github.com/opencord/voltha-lib-go/v4 v4.0.8
 	github.com/opencord/voltha-protos/v4 v4.0.12
 	github.com/stretchr/testify v1.6.1