Update core

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

diff --git a/core b/core
index ad884e3..890974d 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit ad884e358383200846eef6db76c97f67283fdaea
+Subproject commit 890974df9846549c2ad49feba5fd4b93d81de0ec