* Added all Bootsswatch themes (https://bootswatch.com/)
* Removed default theme, kept only Bootstrap (though like over 10 themes now)
* Removed PHP 5 support, only >= 7
* Upgraded Silex v1 to v2
* Upgraded Twig v1 to v2
* Upgraded Symfony/twig-bridge v2 to v3
* Upgraded Symfony/filesystem v2 to v3
* Upgraded Phpunit v4 to v6
* Moved from Showdown to Marked (more features)
* For building requires (not required for the server):