Start version 2.1.0-dev

Change-Id: I47c4a020e7ca1b194b0b44972554c223e35ae415
diff --git a/VERSION b/VERSION
index 38f77a6..c10edc3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.1
+2.1.0-dev