edits to upgrading from 4.0 to 4.1

I updated one of my projects from 4.0 to 4.1. In reading the documentation, I instantly `ran php artisan auth:reminders-controller` to create my reminders. That resulted in an error because I hadn't run `composer update` yet. I thought that it would be nice to let other knows not to run that until they are done upgrading.

Also, when I ran `composer update`, I saw some "Permission Denied" errors. I re-ran `composer update` this time with sudo and it all went fine.

Ravi.