Awesome

electron-prebuilt-updater

A web service that automatically updates and releases a new version of electron-prebuilt when there is a release of Electron.

create a personal access token

Generate a new token; you'll need it for the Heroku config variables.

install the web service

1. 
2. Replace the placeholder config variables with the appropriate values.
3. Click View and note the URL. That is the GitHub Webhook Payload URL.

setup the webhook

1. Create a new webhook with your payload URL and the same secret you used in the Heroku config variables.
2. Click Let me select individual events, deselect Push and enable Release.
3. Click Add webhook.