Bump xos libraries to version 4.0.0

Change-Id: If2cd9948426956a237e5ab65c3cfb724966bf521
diff --git a/VERSION b/VERSION
index 276cbf9..2468aa9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.0
+3.0.0-dev