minor #2728 SelfUpdateCommand - verify that it's possible to replace current file (keradus)
minor #2728 SelfUpdateCommand - verify that it's possible to replace current file (keradus)

This PR was merged into the 2.2 branch.

Discussion
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SelfUpdateCommand - verify that it's possible to replace current file

Commits
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0f5ee09 SelfUpdateCommand - verify that it's possible to replace current file

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