AETHER-3341 bump versions for aether-2.1 development

Change-Id: I91b24967f6369de1f0abd0a13be020fadbbd8d96
diff --git a/VERSION b/VERSION
index 227cea2..e3833ce 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.0
+2.1.0-dev1