Flow-Router params change doesn't trigger re-rendering

I simply need dynamic routing with flow router and react mounter

``` js
FlowRouter.route('/sub/:id', {
  name: "MyComponent",
  action: function(params, queryParams) {
    console.log(params);
    mount(MyComponent, {params: params});
  }
});
```

When `id` change, url change. But view doesn't change, no props change, no rerendering
