Merge pull request #1 from Idearia/update_php_version

PHP8 support

Author: HighLiuk

composer.json

@@ -6,7 +6,7 @@
     "license": "GPL-3.0-or-later",
     "homepage": "https://github.com/Idearia/wordpress-settings-api-class",
     "require": {
-        "php": "^7.0"
+        "php": "^7.0|^8.0"
     },
     "autoload": {
         "psr-4": {