Update README.md

Author: Snailclimb

README.md

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 3. **[如何在 Spring/Spring Boot 中做参数校验？你需要了解的都在这里！](./docs/advanced/spring-bean-validation.md)**
 4. [5分钟搞懂如何在Spring Boot中Schedule Tasks](./docs/advanced/SpringBoot-ScheduleTasks.md) 
 5. **[新手也能看懂的 Spring Boot 异步编程指南](./docs/advanced/springboot-async.md)**
-6. **[Spring Boot 整合 阿里云OSS 存储服务，快来免费搭建一个自己的图床](https://github.com/Snailclimb/springboot-aliyun-oss)** 
 7. **[Kafka 入门+SpringBoot整合Kafka系列](https://github.com/Snailclimb/springboot-kafka)**
 8. [超详细，新手都能看懂 ！使用Spring Boot+Dubbo 搭建一个分布式服务](./docs/advanced/springboot-dubbo.md)
 9. [从零入门 ！Spring Security With JWT（含权限验证）](https://github.com/Snailclimb/spring-security-jwt-guide)