Bump veresion to 1.3.0-dev

Change-Id: I3e7dc3a5c35309e778f56baa93a68e9291a8d1aa
diff --git a/VERSION b/VERSION
index 0c64b5c..b6bb93f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.0-dev
+1.3.0-dev