Update README

README.md

@@ -47,6 +47,7 @@ Install [PrBoom-Plus](https://github.com/coelckers/prboom-plus) and place the bi
     * Stay too long in the past, and your old future will no longer be reachable.
     * Timelines can be saved to or loaded from a file
     * Timelines autoload when present and matching the loaded WAD content
+    * Timeline can be autosaved on exit
     * Be warned! Time travel can be quite disorienting...
 * Bind keys to console commands
     * Console command: `bind [key] [command]`