Make it possible to use custom invoice reference # (#15)

* Update invoicable.php

* Update InvoicableServiceProvider.php

* Update Invoice.php

* Missing class

* Wrong definition in the config file

* No need to include the generator class

config/invoicable.php

@@ -4,4 +4,5 @@
     'default_currency' => 'EUR',
     'default_status' => 'concept',
     'locale' => 'nl_NL',
-];
+    'invoice_reference_generator' => SanderVanHooft\Invoicable\InvoiceReferenceGenerator::class
+];

src/InvoicableServiceProvider.php

@@ -30,6 +30,9 @@ public function boot()
              __DIR__.'/../database/migrations/2017_06_17_163005_create_invoices_tables.php'
              => database_path('migrations/2017_06_17_163005_create_invoices_tables.php'),
          ], 'migrations');
+
+        $config = $this->app->config['invoicable'];
+        $this->app->bind(InvoiceReferenceGenerator::class, $config['invoice_reference_generator']);
     }
 
     /**

src/Invoice.php

@@ -147,7 +147,7 @@ protected static function boot()
         static::creating(function ($model) {
             $model->currency = config('invoicable.default_currency', 'EUR');
             $model->status = config('invoicable.default_status', 'concept');
-            $model->reference = InvoiceReferenceGenerator::generate();
+            $model->reference = app()->make(InvoiceReferenceGenerator::class)->generate();
         });
     }
 }

tests/Feature/InvoiceTest.php

@@ -7,6 +7,7 @@
 use SanderVanHooft\Invoicable\Invoice;
 use SanderVanHooft\Invoicable\TestModel;
 
+
 class InvoiceTest extends AbstractTestCase
 {
     use DatabaseMigrations;