Updating nigtingale img

bedrock/mozorg/templates/mozorg/projects/mozilla-based.html

@@ -212,7 +212,7 @@
   </li>
   <li>
       <!--Nightingale featured  July '14 -->
-      <h3><a href="http://getnightingale.com"><img src="{{ media('/img/projects/mozilla-based/nightingale.jpg')}}"  width="50" height="65" alt=""><span>{{ _('Nightingale') }}</span></a></h3>
+      <h3><a href="http://getnightingale.com"><img src="{{ media('/img/projects/mozilla-based/nightingale.png')}}"  width="50" height="65" alt=""><span>{{ _('Nightingale') }}</span></a></h3>
       <p>{{ _('Nightingale is a community fork of the Songbird media player. Nightingale runs on Mac, Windows, and Linux and plays any audio format you can think of - including FLAC') }}</p>
   </li>
   <li>