创建CHANGELOG.md

CHANGELOG.md

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+# 更新日志 Changelog
+
+MCDiscordChat 2.0.0 for Minecraft 1.16.x/1.17.x/1.18.x - 2022/3/23
+
+此版本与之前的版本相比有重大变化，请务必备份你的旧 MCDiscordChat 配置文件 (mcdiscordchat.json)，重新阅读 [MCDiscordChat 文档](https://blog.xujiayao.top/posts/4ba0a17a/) ，并且不要直接从旧配置文件中复制和粘贴任何内容，因为这可能会导致错误！
+This version is a significant change from previous versions. Please make sure to backup your old MCDiscordChat config file (mcdiscordchat.json), re-read the [MCDiscordChat Docs](https://blog.xujiayao.top/posts/4ba0a17a/) and do not copy and paste anything directly from the old config file, as this may cause errors!
+
+## 新特性 New Features
+
+- 启动服务器时打印 MCDC 介绍
+  Print MCDC introduction when starting the server
+  @Xujiayao
+
+- 新版本可用时显示更新日志
+  Show changelog when a new version is available
+  @Xujiayao
+
+- 添加 GitHub 议题模板
+  Add GitHub issue templates
+  @Xujiayao
+
+- Unicode 表情符号（非服务器自定义表情符号）也可以在游戏中高亮显示
+  Unicode emoji (non-server custom emoji) can also be highlighted in-game
+  @Xujiayao
+
+## 更改 Changes
+
+- 重写所有文件并优化代码和逻辑
+  Rewrite all files and optimize code and logic
+  @Xujiayao
+
+- 修改项目描述
+  Modify project description
+  @Xujiayao
+
+- 更改消息冷却的实现方式
+  Change the implementation method of message cooldown
+  @Xujiayao
+
+## 移除 Removed
+
+- 不再向 Discord 频道发送异常堆栈跟踪
+  Exception stack traces are no longer sent to Discord channel
+  @Xujiayao
+
+## 详细信息 Detailed Information
+
+https://github.com/Xujiayao/MCDiscordChat/compare/1.12.1...master