minor changes made to make compatible with code structure

app/Events/Sale/InvoiceReminded.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Events\Sale;
+
+use Illuminate\Queue\SerializesModels;
+
+class InvoiceReminded
+{
+    use SerializesModels;
+
+    public $invoice;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param $invoice
+     */
+    public function __construct($invoice)
+    {
+        $this->invoice = $invoice;
+    }
+}