update

Author: dyc87112

README.md

@@ -22,7 +22,7 @@
           </td>
           <td align="center" valign="middle">
             <a href="https://promotion.aliyun.com/ntms/act/ambassador/sharetouser.html?userCode=wxfqkr0o&utm_source=wxfqkr0o" target="_blank">
-              <img width="300" src="https://github.com/dyc87112/SpringBoot-Learning/blob/master/sponsor/git-springboot-sponsor-2.jpg?raw=true">
+              <img width="300" src="https://github.com/dyc87112/SpringBoot-Learning/blob/master/sponsor/git-springboot-sponsor-2-300x100.jpg?raw=true">
             </a>
           </td>
         </tr>