:art: Fix c++ warning

diff --git a/plug b/plug
index 4e1a5605c21739be838eac0c26401027cf29ac9b..2957e2f851173d2bfa9e8e3e9cf02b56daa6e216 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 4e1a5605c21739be838eac0c26401027cf29ac9b
+Subproject commit 2957e2f851173d2bfa9e8e3e9cf02b56daa6e216