Merge pull request #713 from flightphp/use-best-practices-in-index.php

Use static callables with type hints

index.php

@@ -4,7 +4,7 @@ declare(strict_types=1);
 
 require_once __DIR__ . '/flight/autoload.php';
 
-Flight::route('/', function () {
+Flight::route('/', static function (): void {
     echo 'hello world!';
 });