send notification on update failure

app/Events/Install/UpdateFailed.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Events\Install;
+
+use App\Abstracts\Event;
+
+class UpdateFailed extends Event
+{
+    public $alias;
+
+    public $old;
+
+    public $new;
+
+    public $step;
+
+    public $message;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param  $alias
+     * @param  $old
+     * @param  $new
+     * @param  $step
+     */
+    public function __construct($alias, $old, $new, $step, $message = '')
+    {
+        $this->alias = $alias;
+        $this->old = $old;
+        $this->new = $new;
+        $this->step = $step;
+        $this->message = $message;
+    }
+}