Correct bootstrapcdn link

src/_includes/thanks-to.html

@@ -18,7 +18,7 @@
     <div class="col-md-4 col-sm-4">
       <p>
         Thanks to <a href="http://maxcdn.com"><i class="fa fa-maxcdn">&nbsp;</i>MaxCDN</a> for providing the excellent
-        <a href="http://www.bootstrapcdn.com/#tab_fontawesome">BootstrapCDN</a>, the fastest and easiest way to
+        <a href="http://www.bootstrapcdn.com/#fontawesome_tab">BootstrapCDN</a>, the fastest and easiest way to
         <a href="{{ page.relative_path }}get-started/#bootstrapcdn">get started</a> with Font Awesome.
       </p>
     </div>