minor #2394 Update .gitattributes (SpacePossum)
minor #2394 Update .gitattributes (SpacePossum)

This PR was merged into the 2.0-dev branch.

Discussion
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Update .gitattributes

remove `benchmark.sh` and `box.json` from the export

Commits
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889f3627 Do not export box.sh and benchmark.sh.

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