Update VERSION to point to next dev version

Change-Id: I85e53280864b8fd3993cefc502e30af6729f70f5
diff --git a/VERSION b/VERSION
index 26aaba0..b6bb93f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.0
+1.3.0-dev