Switch to Loadsys Codesniffer v3.

Author: beporter

composer.json

@@ -26,7 +26,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "~4.1",
-    "squizlabs/php_codesniffer": "~2.0",
+    "loadsys/loadsys_codesniffer": "~3.0",
     "satooshi/php-coveralls": "dev-master"
   },
   "autoload": {