Updates hydra: ef8aeb5 Comment fix

diff --git a/hydra b/hydra
index 0bcacbf1dc6d2af2104111e931704ef1c2fe0f61..ef8aeb50e0d2697c5217fdf0149999b179ece4c6 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 0bcacbf1dc6d2af2104111e931704ef1c2fe0f61
+Subproject commit ef8aeb50e0d2697c5217fdf0149999b179ece4c6