Update PHP version required

PHP 7.3 => 7.2

Author: pH-7

README.md

@@ -69,7 +69,7 @@ I initially created PhoneDetector to redirect users to the correct app's store f
 
 ## ⚙ Server Requirement
 
-PHP 7.3 or higher.
+[PHP 7.2](https://php.net/releases/7_2_0.php) or higher.
 
 
 ## ⚖ License

composer.json

@@ -18,7 +18,7 @@
     }
   ],
   "require": {
-    "php": ">=7.3.0"
+    "php": ">=7.2.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^8.2"