[fs] ErrorException: The Symfony\Component\Filesystem\LockHandler class is deprecated since version 3.4

[makasim]

1) Enqueue\Fs\Tests\FsContextTest::testShouldAllowPurgeMessagesFromQueue
ErrorException: The Symfony\Component\Filesystem\LockHandler class is deprecated since version 3.4 and will be removed in 4.0. Use Symfony\Component\Filesystem\SemaphoreStore or Symfony\Component\Filesystem\FlockStore instead.
/home/travis/build/php-enqueue/fs/vendor/symfony/filesystem/LockHandler.php:14
/home/travis/build/php-enqueue/fs/FsContext.php:227
/home/travis/build/php-enqueue/fs/FsContext.php:113
/home/travis/build/php-enqueue/fs/FsContext.php:184
/home/travis/build/php-enqueue/fs/Tests/FsContextTest.php:180

https://travis-ci.org/php-enqueue/fs/jobs/263110961