Use a medium strength generator for ircmaxell/random-lib

As discussed in https://github.com/ramsey/uuid/issues/56
<?php
/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 * @link https://benramsey.com/projects/ramsey-uuid/ Documentation
 * @link https://packagist.org/packages/ramsey/uuid Packagist
 * @link https://github.com/ramsey/uuid GitHub
 */

namespace Ramsey\Uuid\Generator;

use RandomLib\Generator;
use RandomLib\Factory;

class RandomLibAdapter implements RandomGeneratorInterface
{
    private $generator;

    public function __construct(Generator $generator = null)
    {
        $this->generator = $generator;

        if ($this->generator == null) {
            $factory = new Factory();

            $this->generator = $factory->getMediumStrengthGenerator();
        }
    }

    public function generate($length)
    {
        return $this->generator->generate($length);
    }
}

<?php
/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 * @link https://benramsey.com/projects/ramsey-uuid/ Documentation
 * @link https://packagist.org/packages/ramsey/uuid Packagist
 * @link https://github.com/ramsey/uuid GitHub
 */

namespace Ramsey\Uuid\Generator;

use RandomLib\Generator;
use RandomLib\Factory;

class RandomLibAdapter implements RandomGeneratorInterface
{
    private $generator;

    public function __construct(Generator $generator = null)
    {
        $this->generator = $generator;

        if ($this->generator == null) {
            $factory = new Factory();

            $this->generator = $factory->getLowStrengthGenerator();
        }
    }

    public function generate($length)
    {
        return $this->generator->generate($length);
    }
}
