Update core

Signed-off-by: Florent Bruneau <florent.bruneau@polytechnique.org>

diff --git a/core b/core
index 890974d..d1bdef7 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 890974df9846549c2ad49feba5fd4b93d81de0ec
+Subproject commit d1bdef74354a292f610159205fdb974558c15c3b