Improve Update available and Check for updates

[jsoref]

Is your feature request related to a problem? Please describe.
I had Insomnia open, and heard elsewhere that there was a "new version". I went and searched the menus for an updates item and didn't find one. I went to the about dialog and saw that I had an old version, but didn't find any way to update.

Describe the solution you'd like

• Users should be able to visually see there's an update available, w/o staring at their screens 24x7 (i.e. growl notifications are not the way to tell users about updates)
• Users should be able to check for updates by either using help> or app> and either seeing a menu item for "check for updates" or seeing a button in the about dialog

Describe alternatives you've considered
The fact that it's possible through preferences is true, but it is not the expected results of users today.

Additional context

Pictures of various update flows

Chrome

Chrome update indicator

Chrome about

Firefox

Firefox update indicator

Firefox about

Check for updates in menus

[DanielRouxSA]

I know this discussion is over a year old now without any activity, but I'd very much like to see this moved forward; the current update workflow for Insomnia is rather inelegant compared to almost every other app I've used that incorporates self-updating.