Remove Chinese-speaking Telegram Group

Author: Hentioe

README.md

@@ -567,7 +567,6 @@ described in [RFC 8032]
  * [Stackoverflow](https://stackoverflow.com/tags/crystal-lang/info)
 
 ## Unofficial
- * [Chinese-speaking Telegram Group](https://t.me/crystal_cn) - 来吧！TG 中文圈的朋友们！
  * [Crystal Programming Discord Server](https://discord.gg/YS7YvQy) - Unofficial Discord server dedicated to the Crystal Programming Language
  * [Portuguese-speaking Telegram Group](https://t.me/crystalbrasil) - Bem vindos ao Crystal Brasil!
  * [Russian-speaking Telegram Group](https://t.me/crystal_ru) - Добро пожаловать, товарищ!