make installable in OXID 7

composer.json

@@ -30,8 +30,8 @@
     "GPL-3.0-or-later"
   ],
   "require": {
-    "php": ">=7.3",
+    "php": "^8",
-    "oxid-esales/oxideshop-ce": "6.10 - 6.14",
+    "oxid-esales/oxideshop-ce": "7.0 - 7.1",
     "pear/net_smtp": "^1.11",
     "mika56/spfcheck": "^2.1.1",
     "beberlei/assert": "^3.3"
@@ -42,20 +42,9 @@
     "phpstan/phpstan": "^1.8",
     "boxblinkracer/phpunuhi": "^1.12"
   },
-  "extra": {
-    "oxideshop": {
-      "blacklist-filter": [
-        "*.md",
-        "composer.json",
-        ".php-cs-fixer.php",
-        "*.neon"
-      ],
-      "target-directory": "d3/mailconfigchecker"
-    }
-  },
   "autoload": {
     "psr-4": {
-      "D3\\MailConfigChecker\\": "../../../source/modules/d3/mailconfigchecker"
+      "D3\\MailConfigChecker\\": ""
     }
   },
   "scripts": {