我正在阅读 Symfonycasts 上的 Symfony 4 教程，实际上我被困在 Symfony 4 Fundamentals: Services, Config & Environments 课程中的第 13 章“使用平均文档安装捆绑包”。
我试图让这个在 Symfony 5 上工作，但是当我运行 composer 命令时：
composer require nexylan/slack-bundle:* php-http/guzzle6-adapter:*
我收到以下错误消息：
Problem 1
- nexylan/slack-bundle v2.2.0 requires symfony/http-kernel ^3.4 || ^4.0 -> no matching package found.
- nexylan/slack-bundle v2.1.0 requires symfony/http-kernel ^3.4 || ^4.0 -> no matching package found.
- nexylan/slack-bundle v2.0.1 requires symfony/http-kernel ^3.4 || ^4.0 -> no matching package found.
- nexylan/slack-bundle v2.0.0 requires symfony/http-kernel ^3.4 || ^4.0 -> no matching package found.
- nexylan/slack-bundle v1.1.2 requires symfony/http-kernel ^2.7 || ^3.0 || ^4.0 -> no matching package found.
- nexylan/slack-bundle v1.1.1 requires symfony/http-kernel ^2.7 || ^3.0 -> no matching package found.
- nexylan/slack-bundle v1.1.0 requires symfony/http-kernel ^2.7 || ^3.0 -> no matching package foun.
- nexylan/slack-bundle v1.0.1 requires symfony/http-kernel ^2.7 || ^3.0 -> no matching package found
- nexylan/slack-bundle v1.0.0 requires symfony/http-kernel ^2.8 || ^3.0 -> no matching package found.
- Installation request for nexylan/slack-bundle * -> satisfiable by nexylan/slack-bundle[v1.0.0, v1.0.1, v1.1.0, v1.1.1, v1.1.2, v2.0.0, v2.0.1, v2.1.0, v2.2.0].
Installation failed, reverting ./composer.json to its original content.
并且无法安装捆绑包。感谢您的任何建议或帮助！