Update diff option to support PHP CS Fixer v3.0 #14
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The --diff-format was removed in version 3.0, all diffs are now udiff.
https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/master/UPGRADE-v3.md
The --diff flag can be used to let the fixer output all the changes it
makes in udiff format.
Re #13
Perhaps an option should be added to allow users to choose between support for v2 and v3?