Update dependencies

composer.json

@@ -26,12 +26,12 @@
 	"require": {
 		"php": ">=7.3",
 		"composer/installers": "^1.7",
-		"phpunit/phpunit": "^7.5",
 		"pressbooks/mix": "^2.1",
 		"soberwp/intervention": "1.2.0-p",
 		"spatie/color": "^1.1"
 	},
 	"require-dev": {
+		"phpunit/phpunit": "^7.5",
 		"pressbooks/coding-standards": "^1.1",
 		"wpreadme2markdown/wp2md": "^3.0",
 		"yoast/phpunit-polyfills": "^1.0.1"