README.md

bottom-tab 固定与屏幕底部按钮     
```html
<h-view>
    <bottom-tab :show-divider="true">
      <tab-button cusClass="button-exit" @click.native="showConfirm"><img
        src="../assets/image/myInfo/loginout@2x.png">退出
      </tab-button>
      <tab-button :disable="true" @click.native="showSuccess">登陆</tab-button>
    </bottom-tab>
</h-view>    
```