minor #2535 Make .gitignore entries more specific (julienfalque)
minor #2535 Make .gitignore entries more specific (julienfalque)

This PR was merged into the 2.1 branch.

Discussion
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Make .gitignore entries more specific

- `vendor` is supposed to be a directory;
-  ignored targets are at the project's root only, also prevents some `.php_cs` files in the tests fixtures to be covered by the `.gitignore` while still being tracked.

Commits
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035a8b1 Make .gitignore entries more specific

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