Merge pull request #39 from TheDragonCode/2.x

Added `ShouldQueue` contract

Author: Andrey Helldar

src/Queue/ShouldQueue.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DragonCode\Contracts\Queue;
+
+interface ShouldQueue
+{
+}