Update core.

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

diff --git a/core b/core
index 0be5c71..1023ed5 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 0be5c71cbe61952dd302aa11d5acf1ace292aaf3
+Subproject commit 1023ed57b6a5000ff2ebd5cfd74786f98ed4d445