update mezzanine

diff --git a/lib/mezzanine b/lib/mezzanine
index 4b4d22ae261c52df6ef0437bf05cf11f445055de..51cf69d973848f08bc482022fd5bdac9a41f8ff9 160000 (submodule)
--- a/lib/mezzanine
+++ b/lib/mezzanine
@@ -1 +1 @@
-Subproject commit 4b4d22ae261c52df6ef0437bf05cf11f445055de
+Subproject commit 51cf69d973848f08bc482022fd5bdac9a41f8ff9