The import string for voltha-lib-go library needs to change from v5
to v6 after a major version upgrade of the voltha-lib-go library.

Change-Id: If443376b150e0f4bb49f50cb2c8cf8c132b7244b
diff --git a/go.mod b/go.mod
index ab0b50c..2696533 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/opencord/voltha-lib-go/v5
+module github.com/opencord/voltha-lib-go/v6
 
 go 1.13