Update PHP version documentation

README.md

@@ -44,7 +44,7 @@ and for developers you may also need :
 
 This software uses:
 
-* **PHP5.6** currently (migration to PHP7.x is in the pipe)
+* **PHP7.3** currently
 * **phinx** to inject database schema and initial data / accounts into MySQL see https://phinx.org/ 
 * **php-cs-fixer** to check php code for errors and fix coding standard issues, see https://github.com/FriendsOfPHP/PHP-CS-Fixer
 * **doctrine/dbal** as ORM see https://github.com/doctrine/dbal