lint fix

namespace OCA\Calendar\Middleware;

use OCA\Calendar\Controller\InvitationMaybeController;

use OCA\DAV\Connector\Sabre\Principal;

use OCA\Dav\Controller\InvitationResponseController;

use OCP\AppFramework\Http\Response;

use OCP\AppFramework\Middleware;

use OCP\Mail\IMailer;

use Psr\Log\LoggerInterface;

use Sabre\VObject\Reader;

use OCA\DAV\Connector\Sabre\Principal;

class InvitationMiddleware extends Middleware {

	private $request;