VOL-2828 Bump post-2.3 release

Change-Id: Idb5e5331fd489ee2db91690e287149702212f45f
diff --git a/VERSION b/VERSION
index 276cbf9..eef2640 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.0
+2.4.0-dev0