添加砍价接口返回砍价时间

app/Endpoint/Api/Http/Resources/BargainOrderLogResource.php

@@ -22,6 +22,7 @@ class BargainOrderLogResource extends JsonResource
                 return $this->userInfo->avatar;
             }, ''),
             'bargain_amount' => $this->bargain_amount_format,
+            'created_at' => $this->created_at->format('Y-m-d H:i:s'),
         ];
     }
 }