upgrading release version to 1.4.0-dev

Change-Id: I9f61b70881ea21c17e64a9b7e2c19dd11ce4367d
diff --git a/VERSION b/VERSION
index f0bb29e..c3f0d2b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.3.0
+1.4.0-dev