Get a notification if a new version (tag) is created Before there was a RSS fead that got update if a new release of drush is available, see question:
Getting an email notification when a new Drush version is available.

But after drush is moved to github it seems that the RSS feed does not get updated anymore.

Is there a possibility to get an email notification if a new release tag is created on the github site?
Not directly through Github, but check https://sibbell.com

It's notifies you of new Github releases.