Version 1.5.0

Added
* Reboot requirement info to approval message
* Ability to set window when update is automatically approved or
  installed in case of delayed approve

Changed
* Switch from state log to changelog and improve notifications about
  changes and updater crashes
* `approvals.current` now returns `reboot` field as optional string
  instead of boolean. This was done to allow access to the information
  when reboot is requested to be performed.