Add codeception dependencies

Author: polevaultweb

composer.json

@@ -33,7 +33,11 @@
   "config": {
     "sort-packages": true,
     "allow-plugins": {
-      "composer/installers": true
+      "composer/installers": true,
+      "dealerdirect/phpcodesniffer-composer-installer": true
     }
+  },
+  "require-dev": {
+    "lucatume/wp-browser": "dev-master"
   }
 }