Allow pestphp plugin inside composer (#31)

Author: mhdcodes

composer.json

@@ -48,6 +48,9 @@
         ]
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "pestphp/pest-plugin": true
+        }
     }
 }