update README.md.

Signed-off-by: 聆听 <sugar1569@vip.qq.com>

README.md

@@ -36,9 +36,11 @@ CRMEB开源商城系统PHP版
 [comment]: <> ([宽屏预览]&#40;https://gitee.com/ZhongBangKeJi/CRMEB/blob/master/README.md&#41;)
 
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 <div align="center" >
 <a href="https://gitee.com/ZhongBangKeJi/CRMEB/blob/master/README.md">宽屏预览</a>
 </div>
+</div>
 
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