Further increase required version of PHP Postcodes for proper Laravel 8 support

Author: DivineOmega

composer.json

@@ -6,7 +6,7 @@
         "php": ">=7.1",
         "laravel/framework": "^5.6||^6.0||^7.0||^8.0",
         "divineomega/php-countries": "^2.1",
-        "divineomega/php-postcodes": "^4.4",
+        "divineomega/php-postcodes": "^4.5",
         "langleyfoxall/simple-google-maps": "^1.0",
         "divineomega/php-distance": "^1.0"
     },