Add discord server for SRS

README.md

@@ -13,6 +13,7 @@
 [![](https://badgen.net/twitter/follow/winlinvip)](https://twitter.com/winlinvip)
 [![](https://img.shields.io/youtube/channel/views/UCP6ZblCL_fIJoEyUzZxC1ng?style=social)](https://www.youtube.com/channel/UCP6ZblCL_fIJoEyUzZxC1ng)
 [![](https://img.shields.io/twitch/status/winlinvip?style=social)](https://www.twitch.tv/winlinvip)
+[![](https://badgen.net/discord/members/yZ4BnPmHAd)](https://discord.gg/yZ4BnPmHAd)
 
 SRS/4.0，[Leo][release4]，是一个简单高效的实时视频服务器，支持RTMP/WebRTC/HLS/HTTP-FLV/SRT。