Oops, wrong core version.

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

diff --git a/core b/core
index eec9962..30f983a 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit eec996233a443d9d024786583c0370a54d639dde
+Subproject commit 30f983a171d82c6a8f421036a137950af6a0395a