laravel composer报错You can run './vendor/bin/upgrade-carbon' to get help in updating carbon and other

报错详情:You can run ‘./vendor/bin/upgrade-carbon’ to get help in updating carbon and other frameworks and libraries that depend on it.

前言:这两天在将两个laravel-admin后台合并为一个中台，然后在运行composer的时候，抛出错误，但是程序还能运行，因为强迫症，所以就看了看错误原因:

解决办法:

在composer.json的require中增加

"kylekatarnls/laravel-carbon-2": "^1.0.0","nesbot/carbon": "2.16.3 as 1.34.0"

然后执行composer update