update require composer

Author: plumthedev

composer.json

@@ -2,9 +2,10 @@
  "name": "plumthedev/yii2-php-cs-fixer-config",
  "description": "Yii2 PHP coding standards configuration",
  "type": "library",
- "require": {},
- "require-dev": {
+ "require": {
  "friendsofphp/php-cs-fixer": "^2.16",
+ },
+ "require-dev": {
  "phpunit/phpunit": "4.3.*"
  },
  "scripts": {