Bug #363459 --> update credits list.

mail/base/content/credits.xhtml

@@ -282,6 +282,7 @@
             <li>Chase Phillips</li>
             <li>Neil Rashbrook</li>
             <li>Robert Sayre</li>
+            <li>Phil Ringnalda</li>
             <li>Asaf Romano</li>
             <li>Brian Ryner</li>
             <li>Žiga Sancin</li>