Update README.md

增加https://github.com/alibaba/transmittable-thread-local链接和简介.
ofpay · Oct 12, 2017 · 3f15f21 · 3f15f21
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+:point_right: [Transmittable ThreadLocal(TTL)](https://github.com/alibaba/transmittable-thread-local) 在使用线程池等会缓存线程的组件情况下，提供ThreadLocal值的传递功能，解决异步执行时上下文传递的问题。支持JDK 9/8/7/6。
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 示例：
 
 ## 1.项目依赖
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               value='%d{yyyy-MM-dd HH:mm:ss.SSS}|%X{uuid}|%level|%M|%C\:%L|%thread|%replace(%.-2000msg){"(\r|\n)","\t"}|"%.-2000ex{full}"%n'/>
 </configuration>
 
-```
+```