Update version for 1.1.0-rc0 release

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/VERSION b/VERSION
index ac2282a..34b3170 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.90
+1.0.91