Update composer installers in skeletons

Author: iMattPro

skeleton/composer.json.twig

@@ -19,7 +19,7 @@
     ],
     "require": {
         "php": "{{ REQUIREMENTS.php_version }}",
-        "composer/installers": "~1.0"
+        "composer/installers": "^1.0{% if skeleton_version_compare(REQUIREMENTS.phpbb_version_max, "4.0.0", ">") %} || ^2.0{% endif %}"
     },
 {% if COMPONENT.build %}
     "require-dev": {