update 更新 springboot 版本标签

README.md

@@ -5,7 +5,7 @@
 [![使用IntelliJ IDEA开发维护](https://img.shields.io/badge/IntelliJ%20IDEA-提供支持-blue.svg)](https://www.jetbrains.com/?from=RuoYi-Vue-Plus)
 <br>
 [![RuoYi-Vue-Plus](https://img.shields.io/badge/RuoYi_Vue_Plus-2.6.0-success.svg)](https://gitee.com/JavaLionLi/RuoYi-Vue-Plus)
-[![Spring Boot](https://img.shields.io/badge/Spring%20Boot-2.4-blue.svg)]()
+[![Spring Boot](https://img.shields.io/badge/Spring%20Boot-2.5-blue.svg)]()
 [![JDK-8+](https://img.shields.io/badge/JDK-8+-green.svg)]()
 [![JDK-11](https://img.shields.io/badge/JDK-11-green.svg)]()