release voltha-go 2.3.3

Change-Id: Ie1c9b8ebd2a74d143307ac10ee2d4d399a700418
diff --git a/VERSION b/VERSION
index ca2d639..0bee604 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.3-dev
+2.3.3