Add allow-plugins entry to composer config (#2257)

* Add allow-plugins entry to composer config
* Update package-lock.json

Author: diegocurbelo

composer.json

@@ -6,7 +6,11 @@
 		"config": {
       "platform": {
         "php": "7.1"
-      }
+      },
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true,
+            "composer/installers": true
+        }
     },
     "require-dev": {
 				"composer/installers": "1.9.0",