Update README.md

Author: kevzlou7979

README.md

@@ -20,6 +20,7 @@ A Google Material Design wrapper for GWT <br>
  <li><a href="http://gwt-material.appspot.com/#datagrid">Material Datagrid v1 Implementation with MaterialCheckboxCell and MaterialButtonCell</a></li>
  <li><a href="http://gwt-material.appspot.com/#forms">Material CheckBox Styles (Filled in)</a></li>
  <li><a href="http://gwt-material.appspot.com/#forms">Material Radio Button Styles (With GAP)</a></li>
+ <li><a href="http://gwt-material.appspot.com/#tabs">Material Tabs setTabIndex(index) method</a></li>
 </ul>
 
 <h3>Version 1.3.2</h3>