Use last version of core.

Signed-off-by: Vincent Zanotti <vincent.zanotti@polytechnique.org>

diff --git a/core b/core
index 36f472d..37c45da 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 36f472dc1d8abe2ac18079b04cf8b6a2e10522be
+Subproject commit 37c45da5e78e9cd0660ec825447ea117830bf28e