Update core

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

diff --git a/core b/core
index 4d68bcd..2ce9862 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 4d68bcde441a96abbec1d6c776246c8df323a6b0
+Subproject commit 2ce986248cd0aad8fce405f188cf554da5610713