Post release increment to version 2.1.1-dev

Change-Id: I7d74fae94a54a973c78bfd4b6845fbc3c1120669
diff --git a/VERSION b/VERSION
index 7ec1d6d..7c7e096 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.0
+2.1.1-dev