Updates hydra: 12a9ece Fix: README

diff --git a/hydra b/hydra
index f8c97f70cfd88ed51ce1ff509b3e5fb27c11d691..12a9ece816315a3ab363b6c4ce37aca639cb3d55 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit f8c97f70cfd88ed51ce1ff509b3e5fb27c11d691
+Subproject commit 12a9ece816315a3ab363b6c4ce37aca639cb3d55