Update PHP version requirements in composer.json

Author: donatj

composer.json

@@ -21,10 +21,10 @@
 		}
 	],
 	"require": {
-		"php" : ">=5.3.0"
+		"php" : ">=7.2.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~4.8|~9|~11"
+		"phpunit/phpunit": "~8|~9|~11"
 	},
 	"autoload"   : {
 		"files": ["src/array.php"]