VOL-2630 Release voltha-simonu-adapter 2.2.3

Change-Id: If10adfffb369664fc8b084b7461bf41761a53c97
diff --git a/VERSION b/VERSION
index 7dd050c..5859406 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.3-dev
+2.2.3