laravel 6

fix version constraint

worker can be class that extends from RabbitMQQueue class

Merge pull request vyuldashev#243 from hex7c0/hex7c0-patch-1

queue: add message routingKey property

Merge pull request vyuldashev#242 from hex7c0/master

Feature: add message expiration property

update readme

remove horizon

hotfix vyuldashev#229 by removing createPayloadArray since it changed…

… in Laravel 5.7

Merge pull request vyuldashev#231 from adm-bome/fix-for-horizon-faile…

…d-rabbitmq-jobs

Added extra listener when horizon is used as worker.

Merge pull request vyuldashev#228 from vyuldashev/analysis-zEjQ4O

Apply fixes from StyleCI