Update README_ZH.md

README_ZH.md

@@ -9,7 +9,7 @@ Sky Walking | [English](README.md)
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 [![codebeat badge](https://codebeat.co/badges/579e4dce-1dc7-4f32-a163-c164eafa1335)](https://codebeat.co/projects/github-com-wu-sheng-sky-walking)
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+[![Join the chat at https://gitter.im/openskywalking/Lobby](https://badges.gitter.im/openskywalking/Lobby.svg)](https://gitter.im/openskywalking/Lobby)
 [![OpenTracing-1.x Badge](https://img.shields.io/badge/OpenTracing--1.x-enabled-blue.svg)](http://opentracing.io)