Update index.html

Author: BMSVieira

demo/index.html

@@ -147,6 +147,7 @@ <h3>Super easy-to-use scrollbar</h3>
     <span style="color: #d0d0d0">onTop:</span> <span style="color: #6ab825; font-weight: bold">function</span><span style="color: #d0d0d0">(){},</span>
     <span style="color: #d0d0d0">onMove:</span> <span style="color: #6ab825; font-weight: bold">function</span><span style="color: #d0d0d0">(){},</span>
     <span style="color: #d0d0d0">onDragStart:</span> <span style="color: #6ab825; font-weight: bold">function</span><span style="color: #d0d0d0">(){}</span>
+    <span style="color: #d0d0d0">onDragStop:</span> <span style="color: #6ab825; font-weight: bold">function</span><span style="color: #d0d0d0">(){}</span>
 <span style="color: #d0d0d0">});</span>
 </pre></div>