move package to v2 version as per go requirements after update to version 2.0

Change-Id: Iac4cc56f014f49e7d241357f8b7a5f4f3047bedc
diff --git a/go.mod b/go.mod
index 33a1e5b..b1f881b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/opencord/omci-lib-go
+module github.com/opencord/omci-lib-go/v2
 
 go 1.16