Update version to v3.1.1

Change-Id: I8f332cf01e77fc4c09f767099512cbabce13e94f
Signed-off-by: abhayk <abhayk@radisys.com>
diff --git a/VERSION b/VERSION
index fd2a018..94ff29c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.1.0
+3.1.1