Allow certain plugins so Composer doesn't break.

Author: geerlingguy

composer.json

@@ -37,7 +37,13 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "composer/installers": true,
+            "cweagans/composer-patches": true,
+            "drupal/core-composer-scaffold": true,
+            "zaporylie/composer-drupal-optimizations": true
+        }
     },
     "scripts": {
         "post-install-cmd": [