Implicitly marking parameter $previous as nullable is deprecated

[rafaeldrincon]

Small detail

PHP Deprecated: Route4Me\Exception\ApiError::__construct(): Implicitly marking parameter $previous as nullable is deprecated, the explicit nullable type must be used instead in vendor/route4me/route4me-php/src/Route4Me/Exception/ApiError.php on line 9

Deprecated: Route4Me\Exception\ApiError::__construct(): Implicitly marking parameter $previous as nullable is deprecated, the explicit nullable type must be used instead in vendor/route4me/route4me-php/src/Route4Me/Exception/ApiError.php on line 9

[rafaeldrincon]

OLD

public function __construct(string $message = '', int $code = 0, string $source = '', \Throwable $previous = null)

NEW

public function __construct(string $message = '', int $code = 0, string $source = '', ?\Throwable $previous = null)