Start version 2.1.0-dev

Change-Id: I820b0f3b915059418e011b963fb87b235f9222cb
diff --git a/VERSION b/VERSION
index 38f77a6..c10edc3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.1
+2.1.0-dev