fix readme error

README.md

@@ -13,7 +13,7 @@
     <img alt="maven" src="https://img.shields.io/maven-central/v/com.baomidou/mybatis-plus.svg?style=flat-square">
   </a>
 
-  <a href="https://github.com/vuejs/vue">
+  <a href="https://www.apache.org/licenses/LICENSE-2.0">
     <img alt="code style" src="https://img.shields.io/badge/license-Apache%202-4EB1BA.svg?style=flat-square">
   </a>
 </p>