SEBA-736 release xos 3.3.1

Change-Id: If239ca35f2f921f57cca48a52c8a73136b8c1858
diff --git a/VERSION b/VERSION
index 76726bd..bea438e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.3.1-dev
+3.3.1