Update core

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

diff --git a/core b/core
index e10ca15..502bb91 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit e10ca15e8c617074740e5e7868e3eb8e3d69e883
+Subproject commit 502bb918559d93793538b8d9bc451600fbb9c027