An update has been submitted to update EPEL 7's php-symfony package
from version 2.5.12 to LTS version 2.7.7.  The EPEL 7 php-symfony
package will remain at LTS version 2.7.x.

* Full upstream changelogs:
    ** 2.6.x: https://github.com/symfony/symfony/blob/v2.7.7/CHANGELOG-2.6.md
    ** 2.7.x: https://github.com/symfony/symfony/blob/v2.7.7/CHANGELOG-2.7.md
* Upgrade guides:
    ** Upgrade from 2.5 to 2.6:
https://github.com/symfony/symfony/blob/v2.7.7/UPGRADE-2.6.md
    ** Upgrade from 2.6 to 2.7:
https://github.com/symfony/symfony/blob/v2.7.7/UPGRADE-2.7.md

Bodhi update: https://bodhi.fedoraproject.org/updates/php-twig-1.23.1-2.el7%20php-symfony-2.7.7-2.el7