Change the name of Component.render to Component.build in Effen

sky/examples/fn/widgets/menuitem.dart

 part of widgets;
 
 class MenuItem extends ButtonBase {
 
   static Style _style = new Style('''
     transform: translateX(0);
     display: flex;
     align-items: center;
     height: 48px;
     -webkit-user-select: none;'''
@@ skipping 17 matching lines @@
       color: #212121;
       padding: 0px 16px;
       flex: 1;'''
   );
 
   List<Node> children;
   String icon;
 
   MenuItem({ Object key, this.icon, this.children }) : super(key: key);
 
-  Node render() {
+  Node build() {
     return new Container(
       style: _highlight ? _highlightStyle : _style,
       children: [
-        super.render(),
+        super.build(),
         new Icon(
           style: _iconStyle,
           size: 24,
           type: "${icon}_grey600"
         ),
         new Container(
           style: _labelStyle,
           children: children
         )
       ]
     );
   }
 }