Bump version 2.4.0 (#548)

Author: saeedvaziry

config/app.php

@@ -211,7 +211,7 @@
         // 'ExampleClass' => App\Example\ExampleClass::class,
     ])->toArray(),
 
-    'version' => '2.3.0',
+    'version' => '2.4.0',
 
     'demo' => env('APP_DEMO', false),
 ];