Release version 4.0.0

Change-Id: I4a30b6b68247306b04f0727aea0eb9c3902c4446
diff --git a/VERSION b/VERSION
index 3cdeb6b..fcdb2e1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.0.0rc1
+4.0.0