BREAKING CHANGE: Adhere to PSR-12 coding standards.

- Model: where_in method was renamed as whereIn.

src/Libs/Middleware.php

@@ -1,4 +1,7 @@
 <?php
+
+namespace Libs;
+
 /**
  * Middleware - DuckBrain
  *
@@ -8,11 +11,8 @@
  * @website https://kj2.me
  * @licence MIT
  */
-
-namespace Libs;
-
-class Middleware {
-
+class Middleware
+{
     /**
      * Llama al siguiente callback.
      *