Releasing VOLTHA 2.10

Change-Id: I3a30915a6b9cbb441dcdca21ce9792e5e0cc215b
diff --git a/VERSION b/VERSION
index 8d70082..94ff29c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.1.1-dev
+3.1.1