v6 update

app/Http/Resources/Customer/InvoiceItemCollection.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Crater\Http\Resources\Customer;
+
+use Illuminate\Http\Resources\Json\ResourceCollection;
+
+class InvoiceItemCollection extends ResourceCollection
+{
+    /**
+     * Transform the resource collection into an array.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return array
+     */
+    public function toArray($request)
+    {
+        return parent::toArray($request);
+    }
+}