Tweaked index-dist.php to use

\Slim3MvcTools\Controllers\BaseController::class
in the definition of 'S3MVC_APP_DEFAULT_CONTROLLER_CLASS_NAME'

public/index-dist.php

@@ -26,7 +26,7 @@
 
 // This is used to create a controller object to handle the default / route. 
 // Must be prefixed with the namespace if the controller class is in a namespace.
-define('S3MVC_APP_DEFAULT_CONTROLLER_CLASS_NAME', '\\Slim3MvcTools\\Controllers\\BaseController');
+define('S3MVC_APP_DEFAULT_CONTROLLER_CLASS_NAME', \Slim3MvcTools\Controllers\BaseController::class);
 
 // This is the name of the action / method to be called on the default controller 
 // to handle the default / route. This method should return a response string (ie.