fixing compare diff link

index.html

@@ -1748,7 +1748,7 @@ <h2 id="links">Links &amp; Suggested Reading</h2>
       <h2 id="changelog">Change Log</h2>
 
       <p>
-        <b class="header">1.4.0</b> &mdash; <small><i>Sept. 27, 2012</i></small>  &mdash; <a href="https://github.com/documentcloud/backbone/compare/1.3.3...1.4.0">Diff</a><br />
+        <b class="header">1.4.0</b> &mdash; <small><i>Sept. 27, 2012</i></small>  &mdash; <a href="https://github.com/documentcloud/underscore/compare/1.3.3...1.4.0">Diff</a><br />
         <ul>
           <li>
             Added a <tt>pairs</tt> function, for turning a JavaScript object 
@@ -1801,7 +1801,7 @@ <h2 id="changelog">Change Log</h2>
           </li>
           <li>
             A number of edge-cases fixes and tweaks, which you can spot in the
-            <a href="https://github.com/documentcloud/backbone/compare/1.3.3...1.4.0">diff</a>.
+            <a href="https://github.com/documentcloud/underscore/compare/1.3.3...1.4.0">diff</a>.
             Depending on how you're using Underscore, <b>1.4.0</b> may be more
             backwards-incompatible than usual &mdash; please test when you upgrade.
           </li>