be more explict (or update) PHP version requirement - see https://github.com/postfixadmin/postfixadmin/issues/429

CHANGELOG.TXT

@@ -26,6 +26,7 @@ Version 3.3.1 - 2021/01/11
 
 Version 3.3 - 2021/01/09
 -------------------------------------------------
+   - PostfixAdmin requires PHP 7.0 or greater.
    - Change setup.php to use PHP's password_hash() for the config setup_password . (breaking change, existing setup passwords will fail to work and need regenerating) 
    - Change setup.php to not reveal system paths etc until a setup_password is configured and provided (see: https://github.com/postfixadmin/postfixadmin/issues/402 )
    - Move to bootstrap theme ( see https://github.com/postfixadmin/postfixadmin/pull/172 )

INSTALL.TXT

@@ -9,7 +9,7 @@ REQUIREMENTS
 ------------
 - Postfix
 - Apache / Lighttpd 
-- PHP (for web server)
+- PHP 7.0 or greater (for web server)
 - one of the following databases:
   - MariaDB/MySQL
   - PostgreSQL