add chase and granrose to the credits list

mail/locales/en-US/chrome/messenger/credits.html

@@ -257,7 +257,9 @@
           <h3>Build and Release</h3>
           <div class="credit">
             Don Crandall<br>
+            Jonathan Granrose<br>
             Leaf Nunes<br>
+	    Chase Phillips<br>
             Brian Ryner<br>
           </div>