Updated 'core'.

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

diff --git a/core b/core
index f2b20fb2751e539c238464eba533c47f484d7ee7..e3c9a9ab3fc3f5d6a11b5af02d89cdba472d7ab8 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit f2b20fb2751e539c238464eba533c47f484d7ee7
+Subproject commit e3c9a9ab3fc3f5d6a11b5af02d89cdba472d7ab8