Missing a way to close the app

[nagueva]

I accidentally opened two instances of the app and realize that we don't have a way to close it.

Of course we can do it by command line or activity monitor but would be great to have a way to quit the app in a friendly way.

[zehfernandes]

Fixed the issue of two app instances. 6c2a10f

And now you can quit the app using the shortcut command+q or with the right-click in the icon:

v1.2.0 available
https://github.com/zehfernandes/pliim/releases/tag/v1.2.0

🎉