[SEBA-974] Add copyright for Edgecore

Change-Id: I82a625d63ae02eb594507dcce4f39bcb59cb08f3
diff --git a/event_subscriber.go b/event_subscriber.go
index 160b599..3285f3d 100644
--- a/event_subscriber.go
+++ b/event_subscriber.go
@@ -1,4 +1,5 @@
-// Copyright 2018 Open Networking Foundation
+// Copyright 2018-present Open Networking Foundation
+// Copyright 2018-present Edgecore Networks Corporation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.