added default status to config and set it to invoice _construct method

Author: itskawsar

config/invoices.php

@@ -65,6 +65,8 @@
 
     'disk' => 'local',
 
+    'status' => 'Due',
+
     'seller' => [
         /**
          * Class used in templates via $invoice->seller

src/Invoice.php

@@ -160,6 +160,8 @@ public function __construct($name = 'Invoice')
         $this->items    = Collection::make([]);
         $this->template = 'default';
 
+        $this->status   = config('invoices.status');
+
         // Date
         $this->date           = Carbon::now();
         $this->date_format    = config('invoices.date.format');