Updated 'core'.

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

diff --git a/core b/core
index 1c6401b0efc57aaf1735d05c260be92499cc6e32..15bab1114f3d4e33c67d035a7d3c20a8babeee81 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 1c6401b0efc57aaf1735d05c260be92499cc6e32
+Subproject commit 15bab1114f3d4e33c67d035a7d3c20a8babeee81