Add composer allow-plugins

Author: spawnia

composer.json

@@ -49,6 +49,10 @@
     }
   },
   "config": {
+    "allow-plugins": {
+      "ergebnis/composer-normalize": true,
+      "phpstan/extension-installer": true
+    },
     "preferred-install": "dist",
     "sort-packages": true
   },