Using newest voltha-onos 4.1.3 with olt and igmp fixes

Change-Id: I988b2fe652af63c37d116e41aaf442c4f0895858
diff --git a/VERSION b/VERSION
index 3b851fb..cdb98d2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.1.3-dev
+5.1.3