bump php-cs-fixer to allow self-accessor

Author: abluchet

.travis.yml

@@ -41,7 +41,7 @@ before_install:
   - phpenv config-rm xdebug.ini || echo "xdebug not available"
   - echo "memory_limit=-1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
   - npm install -g swagger-cli
-  - if [[ $lint = 1 ]]; then wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.8.2/php-cs-fixer.phar; fi
+  - if [[ $lint = 1 ]]; then wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.8.4/php-cs-fixer.phar; fi
   - if [[ $lint = 1 ]]; then composer global require --dev 'phpstan/phpstan:^0.8'; fi
   - export PATH="$PATH:$HOME/.composer/vendor/bin"