Update PHP version

Author: riverside

README.md

@@ -6,7 +6,7 @@ PHP Web Application Firewall
 | [![CI][x1]][y1] | [![Latest Stable Version][x2]][y2] | [![License][x3]][y3] |
 
 ### Requirements
-- PHP >= 7.0
+- PHP >= 7.3
 
 ### Installation
 If Composer is not installed on your system yet, you may go ahead and install it using this command line:

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": ">=7.0"
+        "php": ">=7.3"
     },
     "require-dev": {
         "phpunit/phpunit": "8.5.52"