Allow dealerdirect/phpcodesniffer-composer-installer plugin

Author: wojsmol

composer.json

@@ -29,7 +29,10 @@
             "php": "5.4"
         },
         "process-timeout": 7200,
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
     },
     "autoload": {
         "psr-4": {