Include limits.h for SIZE_MAX.

Reported by Leith Bade <leith@mapbox.com>.
diff --git a/THANKS b/THANKS
index ae6a2f1..bd44d5d 100644
--- a/THANKS
+++ b/THANKS
@@ -22,6 +22,7 @@
 Joel Ebrahimi <joel.ebrahimi@gmail.com>
 Jono Spiro <jono.spiro@gmail.com>
 Kohei Yoshida <kohei.yoshida@gmail.com>
+Leith Bade <leith@mapbox.com>
 Lubomir I. Ivanov <neolit123@gmail.com>
 Martin Buchholz <martinrb@google.com>
 Martin Szulecki <m.szulecki@libimobiledevice.org>