minor #4091 Adjust misleading sentence in CONTRIBUTING.md (ostrolucky)
minor #4091 Adjust misleading sentence in CONTRIBUTING.md (ostrolucky)

This PR was merged into the 2.12 branch.

Discussion
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Adjust misleading sentence in CONTRIBUTING.md

In previous message it wasn't clear how to find which branch is still maintained. However, when branch is no longer deleted, it's just deleted. This means users don't need to concern about which branch is maintained.

Commits
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535844a3 Adjust misleading sentence

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