rely on scrunitizer for phpcs

Author: ashnazg

composer.json

@@ -27,7 +27,6 @@
     "require-dev": {
         "mockery/mockery": "~1.0",
         "mikey179/vfsStream": "~1.2",
-        "squizlabs/php_codesniffer": "^2.5",
         "phpunit/phpunit": "~6.5"
     },
     "extra": {