server/apps/files_versions/lib/Capabilities.php

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Christopher Schäpers <kondou@ts.unde.re>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Tom Needham <tom@owncloud.com>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
 
namespace OCA\Files_Versions; 

use OCP\Capabilities\ICapability;

class Capabilities implements ICapability {
	
	/**
	 * Return this classes capabilities
	 *
	 * @return array
	 */
	public function getCapabilities() {
		return [
			'files' => [
				'versioning' => true
			]
		];
	}
}