Start version 2.1.0-dev

Change-Id: I2438748aad8f078a23bac1cef63e24397e93a6d3
diff --git a/VERSION b/VERSION
index 38f77a6..c10edc3 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.1
+2.1.0-dev