Removed unnecessary dev requirement

Author: petermein

composer.json

@@ -16,8 +16,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^5.5",
-    "mockery/mockery": "^0.9.5",
-    "sllh/php-cs-fixer-styleci-bridge": "^2.1"
+    "mockery/mockery": "^0.9.5"
   },
   "autoload": {
     "psr-4": {