declare items prop in TabController

Author: ethanshar

src/components/tabController/index.js

@@ -48,6 +48,10 @@ class TabController extends Component {
   static contextType = TabBarContext;
 
   static propTypes = {
+    /**
+     * The list of tab bar items
+     */
+    items: PropTypes.arrayOf(PropTypes.shape(TabBarItem.propTypes)),
     /**
      * Initial selected index
      */