Merge pull request jsonwebtoken#5 from ADmad/patch-1

Update feature set for PHP's lib.

Author: pose

html/index.html

@@ -281,7 +281,7 @@ <h3 class="panel-title">PHP</h3>
               <div class="col-md-6">
                 <div><i class="fa fa-check-square-o"></i>Sign</div>
                 <div><i class="fa fa-check-square-o"></i>Verify</div>
-                <div><i class="fa fa-square-o"></i><code>exp</code> check</div>
+                <div><i class="fa fa-check-square-o"></i><code>exp</code> check</div>
                 <div><i class="fa fa-square-o"></i><code>aud</code> check</div>
                 <div><i class="fa fa-square-o"></i><code>iss</code> check</div>
               </div>