Adjust copyrights years

<?php
/**
 * SeekQuarry/Yioop --
 * Open Source Pure PHP Search Engine, Crawler, and Indexer
 *
 * Copyright (C) 2009 - 2018  Chris Pollett chris@pollett.org
 *
 * LICENSE:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * END LICENSE
 *
 * TokenTool is used to create suggest word dictionaries and 'n' word gram
 * filter files for the Yioop! search engine.
 *
 * A description of its usage is given in the $usage global variable
 *
 *
 * @author Ravi Dhillon  ravi.dhillon@yahoo.com, Chris Pollett (modified for n
 *     ngrams)
 * @license https://www.gnu.org/licenses/ GPL3
 * @link https://www.seekquarry.com/
 * @copyright 2009 - 2018
 * @filesource
 */

namespace seekquarry\yioop\configs;

use seekquarry\yioop\configs as C;
use seekquarry\yioop\library as L;
use seekquarry\yioop\library\VersionManager;
use seekquarry\yioop\models\Model;

if (php_sapi_name() != 'cli' ||
    defined("seekquarry\\yioop\\configs\\IS_OWN_WEB_SERVER")) {
    echo "BAD REQUEST"; exit();
}
/** Loads common utility functions*/
require_once __DIR__."/../library/Utility.php";
if (!C\PROFILE) {
    echo "Please configure the search engine instance by visiting" .
        "its web interface on localhost.\n";
    exit();
}
/**
 * Used to print out a description of how to use TokenTool.php
 * @var string
 */
$usage = <<<EOD
GroupWikiTool.php
==============

Usage
=====


php GroupWikiTool.php command folder

EOD;
if (empty($argv[2])) {
    $argv[2] = getcwd();
}
$num_args = count($argv);
if ( $num_args != 3 ) {
    echo $usage;
    exit();
}
switch ($argv[1]) {
    case "reset":
        if (file_exists($argv[2] . "/.archive")) {
            $model = new Model();
            $db = $model->db;
            $db->unlinkRecursive($argv[2] . "/.archive");
        }
        $vcs = new VersionManager($argv[2]);
        break;
    case "info":
        break;
    case "version":
        $vcs = new VersionManager($argv[2]);
        $vcs->createVersion();
        break;
    case "clear-lock":
        $lock_file = $argv[2] ."/.archive/LOCK";
        if (file_exists($argv[2])) {
            unlink($lock_file);
            echo "Group Wiki Page Resource Lock file removed!";
        }
        break;
    default:
        echo $usage;
        exit();
}