Remove the sponsorship from the readme (#92)

Author: wu-clan

README.md

@@ -25,7 +25,3 @@ uv add sqlalchemy-crud-plus
 ## 互动
 
 [Discord](https://wu-clan.github.io/homepage/)
-
-## 赞助
-
-如果这个项目对你有帮助，欢迎[请作者喝杯咖啡](https://wu-clan.github.io/sponsor/) ☕