minor #2056 Travis - run nightly PHP (keradus)
minor #2056 Travis - run nightly PHP (keradus)

This PR was merged into the 1.12 branch.

Discussion
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Travis - run nightly PHP

Let us run 7.1@dev on Travis, as we already have few cases for it.
master branch check: https://travis-ci.org/keradus/PHP-CS-Fixer/builds/143149413

Commits
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d1a0a24 Travis - run nightly PHP

felixgomez/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,keradus/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,keradus/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,gharlan/PHP-CS-Fixer