Tagging 0.13.1 for use in open onu go adapter

Change-Id: I7838e22f3b3e51b1afd712afa9db274766c11d9d
diff --git a/VERSION b/VERSION
index d3551ef..c317a91 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.13.1-dev
\ No newline at end of file
+0.13.1