The latest updates composer to be for PHP 7.2, removes the dependency on vlucas/phpdotenv, and adds a new exception.
composer.json
The minimum PHP version has been upped from 7.0 to 7.2, we've added the, already required, ext-json, and upgraded to PHPUnit 8.
vlucas/phpdotenv
This project no longer has a dependency on vlucas/phpdotenv. This is purely as they are updating major version more frequently than this project and so this removal will mean you can use whichever version you wish.
QueueNameRequiredException
Some queues require names for it to work properly, therefore a new QueueNameRequiredException exception has been added to ensure that queues that need at least one queue name have them.