updates after composer update

Author: nigeljamesstevenson

composer.json

@@ -10,5 +10,10 @@
     },
     "require-dev": {
         "phpdocumentor/phpdocumentor": "3.0.0"
+    },
+    "config": {
+        "allow-plugins": {
+            "symfony/flex": true
+        }
     }
 }