Allow plugins and do composer update

composer.json

@@ -5,7 +5,7 @@
 	"homepage": "https://github.com/studiopress/genesis-simple-sidebars",
 	"license": "GPL-2.0-or-later",
 	"require": {
-		"php": "^5.3 || ^7",
+		"php": "^5.3 || ^7 || ^8",
 		"composer/installers": "^1"
 	},
 	"require-dev": {
@@ -16,7 +16,11 @@
 		"wp-coding-standards/wpcs": "^1"
 	},
 	"config": {
-		"sort-order": true
+		"sort-order": true,
+		"allow-plugins": {
+			"composer/installers": true,
+			"dealerdirect/phpcodesniffer-composer-installer": true
+		}
 	},
 	"minimum-stability": "dev",
 	"prefer-stable": true,