fixe failing test

tests/Fixtures/TestModel.php

@@ -2,12 +2,14 @@
 
 namespace Knuckles\Scribe\Tests\Fixtures;
 
+use Illuminate\Database\Eloquent\Model;
+
 /**
  * A demo test model.
  *
  * @author Tobias van Beek <t.vanbeek@tjvb.nl>
  */
-class TestModel
+class TestModel extends Model
 {
     public $id = 1;