问题描述：
使用composer安装插件出现这个报错，无法安装！
报错内容：
PHP Fatal error: Class UpdateHelper\ComposerPlugin contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (Composer\Plugin\PluginInterface::deactivate, Composer\Plugin\PluginInterface::uninstall) in /www/wwwroot/www.gitcc.cn/vendor/kylekatarnls/update-helper/src/UpdateHelper/ComposerPlugin.php on line 11
Fatal error: Class UpdateHelper\ComposerPlugin contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (Composer\Plugin\PluginInterface::deactivate, Composer\Plugin\PluginInterface::uninstall) in /www/wwwroot/www.gitcc.cn/vendor/kylekatarnls/update-helper/src/UpdateHelper/ComposerPlugin.php on line 11