composer 执行脚本时报错：Error: You made a reference to a non-existent script @php artisan package:discover

composer 执行脚本时报错：Error: You made a reference to a non-existent script @php artisan package:discover。。。

发生此问题的原因是composer没有更新到最新版本，可以用命令更新：

composer selfupdate