[VOL-2735]Durations in voltha-lib-go should be specified as type time.Duration not int

Change-Id: I782e44fe1dc041b9eb54fd837950d2176e18fe42
diff --git a/VERSION b/VERSION
index b90b71f..7148b0a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.1.8-dev
+3.1.9