Refer to required PHP version in README

GenieTim · GenieTim · commit a13774f8093a · 2022-07-03T13:19:21.000+02:00
diff --git a/README.md b/README.md
@@ -22,7 +22,7 @@ $text = $qrcode->text(); //return decoded text from QR Code
 ```
 
 ## Requirements 
-* PHP >= 5.6
+* PHP >= 8.1
 * GD Library
 
 
