Notifications on Calendar Changes

I released a new project recently which scratched an itch I've had for a while.&#xA;I subscribe to a number of calendars, and I wanted to receive notifications&#xA;about any changes to those calendars, as they happen. My new project to solve&#xA;this problem is calendiff . It's open&#xA;source, self hosted, and the idea is that you run it on a schedule from cron or&#xA;a systemd timer etc. You…