Allow use this template with PHP 8.x

With the current PHP version constraint it's not possible to use this template with a PHP 8 version.

With this PR, it's possible to use it.

Author: juanmiguelbesada

composer.json

@@ -12,7 +12,7 @@
     }
   ],
   "require": {
-    "php": ">=7.4"
+    "php": "^7.4||^8.0"
   },
   "require-dev": {
     "squizlabs/php_codesniffer": "^3.5",