update 更新协议地址

README.md

@@ -7,7 +7,7 @@
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-[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://gitee.com/dromara/RuoYi-Vue-Plus/blob/master/LICENSE)
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://gitee.com/dromara/RuoYi-Vue-Plus/blob/5.X/LICENSE)
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 <br>
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