docs: 更新贡献者展示链接 (#701)

Author: ayangweb

README.md

@@ -119,7 +119,7 @@
 感谢大家为 BongoCat 做出的宝贵贡献！如果你也希望为 BongoCat 做出贡献，请查阅[贡献指南](.github/CONTRIBUTING.md)。
 
 <a href="https://openomy.com/ayangweb/BongoCat" target="_blank" style="display: block; width: 100%;" align="center">
-  <img src="https://openomy.com/svg?repo=ayangweb/BongoCat&chart=bubble&latestMonth=3" target="_blank" alt="Contribution Leaderboard" style="display: block; width: 100%;" />
+  <img src="https://openomy.com/svg?repo=ayangweb/BongoCat&chart=bubble" alt="Contribution Leaderboard" style="display: block; width: 100%;" />
 </a>
 
 ## 历史星标