If you enable this plugin, and have your slack configured correctly (by adding an Incoming Webhook), every time you
stop a task this will be posted to your slack channel:
I have to say that posting stuff to slack is really easy. No wonder people like it so much. Though I still want to check out matrix which is as easy and cool, but not centralized (and I can (or have to?) run it on my machines!)
If you don't know
tracker, as the script is called), take a short look at the nice demo here (and if you've got a lot of time on your hand, you can read these (old) slides explaining the architecture and implementation).