Update php-cs-fixer docs

[massimo-me]

Version 1.1.0 not contains the php-cs-fixer changes

[WARNING] git@github.com:hootsuite/pre-commit-php.git uses legacy hooks.yaml to provide hooks.
In newer versions, this file is called .pre-commit-hooks.yaml
This will work in this version of pre-commit but will be removed at a later time.
If `pre-commit autoupdate` does not silence this warning consider making an issue / pull request.
[ERROR] `php-cs-fixer` is not present in repository git@github.com:hootsuite/pre-commit-php.git

[FatherShawn]

See #22