[fix]pic url

README.md

@@ -34,23 +34,24 @@
     <tr>
       <td align="center" valign="middle">
         <a href="https://mp.weixin.qq.com/s/li9_YXNVxan6Qgt3Q9FYqA">
-          <img src="https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/2020-8/wangyi.png" style="margin: 0 auto;width:450px" /></a>
+          <img src="./media/sponsor/wangyi.png" style="margin: 0 auto;width:450px" /></a>
       </td>
       <td align="center" valign="middle">
         <a href="https://faxian.lagou.com/discover/05a25f7c41404735b01b7f2a61bcf833.html?ver=2&utm_campaign=gongzhonghaolyw&utm_medium=koushuang&utm_source=weixinlyw">
-          <img src="https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/2020-8/lagou-new.jpeg" style="margin: 0 auto;width:450px" /></a>   
+          <img src="./media/sponsor/lagou-new.jpeg" style="margin: 0 auto;width:450px" /></a>   
       </td>        
     </tr>
     <tr>
       <td align="center" valign="middle">
         <a href="https://t.1yb.co/3tWM">
-          <img src="https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/2020-8/image-20200817202119215.png" style="margin: 0 auto;width:450px" /></a>
+          <img src="./media/sponsor/xiangxue.png" style="margin: 0 auto;width:450px" /></a>
       </td>       
     </tr>
   </tbody>
 </table>
 
 
+
 ## 目录
 
 - [Java](#java)