Add auto update to `@spotlightjs/electron`

[krystofwoldrich]

Something like https://github.com/sparkle-project/Sparkle which show pop up with new version and replaces the current app binary.

[BYK]

Great idea. Found an Electron guide here: https://www.electronjs.org/docs/latest/tutorial/updates

[BYK]

Okay, we are going to follow https://www.electron.build/auto-update as we use electron-builder