Update version to 5.1.1 and add support for synchronous and asynchronous plugin functions

CHANGELOG_CN.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+## [5.1.1] - 2023-1-11
+
+-   插件函数支持同步和异步返回
+
 ## [5.1.0] - 2023-12-23
 
 -   插件函数改为支持异步返回