Update version to 11.0.0-rc1

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/VERSION b/VERSION
index 2b1181d..69d3cd2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-11.0.0-devel
+11.0.0-rc1