demo和文档有BUG

[Skqing]

<div data-toggle="city-picker">
   <input readonly type="text" data-toggle="city-picker" >
</div>

应该是

<div data-toggle="city-picker">
   <input readonly type="text" data-toggle="city-picker" >
</div>

<div data-toggle="city-picker">应该是<div>