use default hover trigger for horizontal menu demo

components/menu/demo/horizontal.md

@@ -37,7 +37,6 @@ class App extends React.Component {
         onClick={this.handleClick}
         selectedKeys={[this.state.current]}
         mode="horizontal"
-        triggerSubMenuAction="click"
       >
         <Menu.Item key="mail">
           <Icon type="mail" />Navigation One

package.json

@@ -64,7 +64,7 @@
     "rc-editor-mention": "^1.0.2",
     "rc-form": "^2.1.0",
     "rc-input-number": "~4.0.0",
-    "rc-menu": "^7.2.0",
+    "rc-menu": "~7.2.2",
     "rc-notification": "~3.1.1",
     "rc-pagination": "~1.16.1",
     "rc-progress": "~2.2.2",