Updated 'core'.

Signed-off-by: Roland Haeder <roland@mxchange.org>

diff --git a/core b/core
index e398349bd5fd39e47c9a9b9249063ac5efc8e139..57d9c524afef252f209990a35283970907890c03 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit e398349bd5fd39e47c9a9b9249063ac5efc8e139
+Subproject commit 57d9c524afef252f209990a35283970907890c03