Cleaned up the models

app/models/Subscriber.php

@@ -8,9 +8,19 @@ class Subscriber extends Model
 {
     use SoftDeletingTrait, ValidatingTrait;
 
+    /**
+     * The validation rules.
+     *
+     * @var string[]
+     */
     protected $rules = [
         'email' => 'required|email',
     ];
 
+    /**
+     * The fillable properties.
+     *
+     * @var string[]
+     */
     protected $fillable = ['email'];
 }