Update version for 2.9.1 release

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
diff --git a/VERSION b/VERSION
index c8e38b6..dedcc7d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.9.0
+2.9.1