Update friendsofphp/php-cs-fixer for php8

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

.travis.yml

@@ -26,10 +26,7 @@ before_install:
 before_script:
   - composer install --prefer-source
   - vendor/bin/parallel-lint --exclude vendor .
-
-  # Once php8 is officially supported by the cs-fixer, the env variable should be dropped
-  # Ref https://github.com/FriendsOfPHP/PHP-CS-Fixer/issues/4702
-  - PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer fix --dry-run --diff
+  - vendor/bin/php-cs-fixer fix --dry-run --diff
   - phpenv config-add ./xdebug.ini
 
 after_script:

composer.json

@@ -42,7 +42,7 @@
         "phpunit/phpunit": "^8.0",
         "psr/log": "^1.0",
         "php-coveralls/php-coveralls": "^2.0",
-        "friendsofphp/php-cs-fixer": "^2.17",
+        "friendsofphp/php-cs-fixer": "^2.18",
         "php-parallel-lint/php-parallel-lint": "^1.2"
     },
     "extra": {