WP Pusher lets you install and update plugins and themes directly from GitHub and Bitbucket. This extension will notify you in Slack every time something has been deployed.
Whenever you push something to your Git repository on GitHub or Bitbucket, and it has been deployed to WordPress with WP Pusher, you will be pinged in Slack to know that everything went OK.
NB: Requires WP Pusher
This plugin requires WP Pusher to work. WP Pusher is free for public Git repositories.