Mark different PHP versions to be conflicting to be in line with other repositories.

Author: rutgerrademaker

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^7.0|^8.0",
+        "php": "^7.0 || ^8.0",
         "phpmd/phpmd": "^2.0",
         "squizlabs/php_codesniffer": "~3.5.4"
     },