Update README.md

9a131b94 · Bernard Xiong · GitHub · a6a5dbd6 · 9a131b94
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 # RT-Thread #

+**The master branch is frozen util v3.0.0 has been updated**
+
 [![Build Status](https://travis-ci.org/RT-Thread/rt-thread.svg)](https://travis-ci.org/RT-Thread/rt-thread)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/RT-Thread/rt-thread?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)