Updated 'core'.

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

diff --git a/core b/core
index 4e6776af7c45da16f4bd7cfbab786c9c77179e01..516a21f3b1c6a0a3272c990c0ce9de0dfb7465d3 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 4e6776af7c45da16f4bd7cfbab786c9c77179e01
+Subproject commit 516a21f3b1c6a0a3272c990c0ce9de0dfb7465d3