Update guidance

Author: paragonie-security

README.md

@@ -28,7 +28,7 @@ Version 2 of this library should work on **PHP 7** or newer. See [the v2.x branc
 
 For PHP 5 support, see [the v1.x branch](https://github.com/paragonie/constant_time_encoding/tree/v1.x).
 
-If you are adding this as a dependency to a project intended to work on both PHP 5 and PHP 7, please set the required version to `^1|^2` instead of just `^1` or `^2`.
+If you are adding this as a dependency to a project intended to work on PHP 5 through 8.4, please set the required version to `^1|^2|^3`.
 
 ## How to Install