Update composer.json

Author: mikebronner

composer.json

@@ -13,14 +13,10 @@
         }
     ],
     "require": {
-        "illuminate/support": "^7.0",
-        "laravel/nova": "*",
+        "illuminate/support": "^8.0",
+        "laravel/nova": "^3.9",
         "symfony/thanks": "^1.1"
     },
-    "require-dev": {
-        "sebastian/phpcpd": "^5.0",
-        "squizlabs/php_codesniffer": "^3.4"
-    },
     "autoload": {
         "psr-4": {
             "GeneaLabs\\NovaMapMarkerField\\": "src/"