updated PHP CS Fixer to new organization

Author: mickaelandrieu

composer.json

@@ -20,7 +20,7 @@
         "twilio/sdk":"~3.12||~4.0"
     },
     "require-dev": {
-        "fabpot/php-cs-fixer": "^1.9",
+        "friendsofphp/php-cs-fixer": "^1.9",
         "illuminate/console": "~4||~5",
         "illuminate/support": "~4||~5",
         "phpunit/phpunit": "~4.5"