VOL-2380 Release voltha-go 2.2.3

Change-Id: I39ac6d835153f5427f9736ec68b459abdb1384d5
diff --git a/VERSION b/VERSION
index 7dd050c..5859406 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.3-dev
+2.2.3