minor #4190 Travis CI - fix config (kubawerlos)
minor #4190 Travis CI - fix config (kubawerlos)

This PR was merged into the 2.12 branch.

Discussion
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Travis CI - fix config

We allow build job with collecting coverage to fail, but since it was changed to use PHP 7.3 it has more flags and make builds [failing](https://travis-ci.org/FriendsOfPHP/PHP-CS-Fixer/builds/474074754) thus we need to update the config.

Commits
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5048d18c Fix Travis CI config

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