fix(array_flatten): Make sure to depend on "illuminate/support"

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

Author: marcelklehr

composer.json

@@ -12,7 +12,8 @@
 		"psr/http-message": "^1.0",
 		"rowbot/url": "^3.0",
 		"xantios/mimey": "^2.1",
-		"fivefilters/readability.php": "^3.1"
+		"fivefilters/readability.php": "^3.1",
+		"illuminate/support": "^5.8.x"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^9.5.26",