Add auto-update feature

[Lka05]

If possible, could you add an auto-update feature?

Because I didn't know github much, I don't know that a new update was released, so I often keep using the old version for a long time when a new version is released. If you add auto-update, it will solve the problem for people like me.

It would be nice if it started automatically when the program started, checked for updates, and if a newer version was available, notified the user and asked want to update.

I would appreciate it if you would consider this.