update README.md

lsky-org · Mar 22, 2022 · 10921b3 · 10921b3
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 - exec、shell_exec 函数
 - readlink、symlink 函数
 - putenv、getenv 函数
+- chmod、chown、fileperms 函数
 
 ### 😋 鸣谢
 - [Laravel](https://laravel.com)