Moved php-cs-fixer to dev dependency where it belongs to

Author: norberttech

composer.json

@@ -18,13 +18,13 @@
         "php": ">=7.0.0",
         "symfony/config": "^2.3|^3.0|^4",
         "symfony/translation": "^2.3|^3.0|^4",
-        "symfony/yaml": "^2.3|^3.0|^4",
-        "friendsofphp/php-cs-fixer": "^2.14"
+        "symfony/yaml": "^2.3|^3.0|^4"
     },
     "require-dev": {
         "thunderer/shortcode": "^0.7",
         "phpspec/phpspec": "^2",
-        "phpunit/phpunit": "^4.5|^5.0"
+        "phpunit/phpunit": "^4.5|^5.0",
+        "friendsofphp/php-cs-fixer": "^2.14"
     },
     "config": {
         "bin-dir": "bin"