Update version for 0.14.0-rc1

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/VERSION b/VERSION
index 0c123d0..bdfb04f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.13.90
+0.13.91