Update index.html

Author: Chris Williams

index.html

@@ -130,7 +130,7 @@ <h2>Conferences for the JavaScript community.</h2>
       <hr/>
       <div class="clearfix">
         <div class="conf opencfp onsale">
-          <a href="http://2015.jsconf.us/" rel="me"><img src="images/jsconf_us.png" alt="JSConf US 2013"/></a>
+          <a href="http://lastcall.jsconf.us/" rel="me"><img src="http://2015.jsconf.us/img/js-sized.png" height="200" width="200" alt="JSConf US LAST CALL"/></a>
           <p>JSConf US</p>
         </div>