Mention Rick Carback.

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THANKS

diff --git a/THANKS b/THANKS
index 2752a0f..e1c43b7 100644
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+++ b/THANKS
@@ -8,6 +8,7 @@
 Joel Ebrahimi <joel.ebrahimi@gmail.com>
 Mikhail Gusarov <dottedmag@dottedmag.net>.
 Pierre Joye <pierre.php@gmail.com>
+Rick Carback <carback1@umbc.edu>
 Roberto Tirabassi <rtirabassi@3di.it>
 Simon Talbot <simont@nse.co.uk>
 Stephen Bryant <steve@bawue.de>