Update tray name/title

[BenJeau]

Thanks @olback for this crate!

I'm wondering if you think it's possible to update the tray name after it is created. I can try implementing it for macos and linux if you think this is a good addition to this crate

[olback]

Sure, PRs are welcome!

[hood]

Any news on this? I'd need to update the tray title, but it looks like display() blocks the thread for now.

[brandonros]

is this same as #16 or slightly different?