Returen status for timezone list command

Author: simpleadm

setup/src/Magento/Setup/Console/Command/InfoTimezoneListCommand.php

@@ -56,6 +56,6 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $table->render($output);
-
+        return \Magento\Framework\Console\Cli::RETURN_SUCCESS;
     }
 }