message: docs(NoticeBar): add vertical scroll demo
diff: @@ -53,6 +53,30 @@ Vue.use(NoticeBar);
  </van-notice-bar>
  ```
  +### Vertical Scroll
  +
  +```html
  +<van-notice-bar left-icon="volume-o" :scrollable="false">
  + <van-swipe
  + vertical
  + class="notice-swipe"
  + :autoplay="3000"
  + :show-indicators="false"
  + >
  + <van-swipe-item>Content 1</van-swipe-item>
  + <van-swipe-item>Content 2</van-swipe-item>
  + <van-swipe-item>Content 3</van-swipe-item>
  + </van-swipe>
  +</van-notice-bar>
  +
  +<style>
  + .notice-swipe {
  + height: 40px;
  + line-height: 40px;
  + }
  +</style>
  +```
  +
  ## API
  ### Props
  