Also, provide better finishing message thanks to WP-CLI's `success`

includes/wp-cli/class-one-time-fixers.php

@@ -98,7 +98,7 @@ class One_Time_Fixers extends \WP_CLI_Command {
 		}
 
 		// Fin
-		\WP_CLI::line( "\n" . __( 'All done.', 'automattic-cron-control' ) );
+		\WP_CLI::success( __( 'All done.', 'automattic-cron-control' ) );
 	}
 }