Add check for update feature

[BakaPhoenix]

Hi! Is possible to add this feature in the app?
One of the great thing that i find using the mac is that every app have and built-it check for update function.
It will be nice if this app have it too.

Thanks

[Steven]

There's check for update feature, but it doesn't work very well on mac. We're working on a new one with notification center notification.