Re #4: updated README.md

Author: creocoder

README.md

@@ -92,7 +92,7 @@ class Post extends \yii\db\ActiveRecord
     public function transactions()
     {
         return [
-            self::SCENARIO_DEFAULT => self::OP_INSERT | OP_UPDATE,
+            self::SCENARIO_DEFAULT => self::OP_INSERT | self::OP_UPDATE,
         ];
     }