Update composer.json

Author: SinSquare

composer.json

@@ -4,7 +4,7 @@
     "license": "MIT",
     "type": "application",
     "require": {
-        "php": "^5.6 || >=7.0 <7.3",
+        "php": "^5.6 || >=7.0",
         "symfony/finder": "^3.0 || ^4.0",
         "symfony/polyfill-php70": "^1.0",
         "symfony/polyfill-php72": "^1.4",