Bump up the version after release

Change-Id: I56f9ae53b74fda4938e99c0201a2c1ae7a2701f6
diff --git a/VERSION b/VERSION
index 6085e94..b6bb93f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.1
+1.3.0-dev