message: docs: update tree
diff: @@ -47,6 +47,7 @@ class Demo extends React.Component {
  data={this.state.treeData}
  onChange={data => {console.log('Tree data:', data)}}
  highlightable
  + defaultHighlightId={1}
  onClick={(item) => console.log('------click node', item)}
  />
  </div>
  