Added yiisoft/yii2 as dependency

Author: plumthedev

composer.json

@@ -3,7 +3,8 @@
  "description": "Yii2 PHP coding standards configuration",
  "type": "library",
  "require": {
- "friendsofphp/php-cs-fixer": "^2.16"
+ "friendsofphp/php-cs-fixer": "^2.16",
+ "yiisoft/yii2": "~2.0.0"
  },
  "require-dev": {
  "phpunit/phpunit": "4.3.*"