Post about new version is here
When script finds new uptate it sends email notification that upgrade process has started, system backup and config file are in attachment. After firmware and routerboard got updated, it sends second email which tells that upgrade process has been finished.
You can choose what update channel to use (stable or current)
Script and instruction how to use it here - https://github.com/beeyev/Mikrotik-Firmware-Auto-Updater