When successful, ask the user to subscribe the updates discussion

[gr2m]

Script authors should subscribe to octoherd/octoherd#6. While at it, we could also ask them to star the https://github.com/octoherd/octoherd repository because who doesn't like a star?

[gr2m]

actually a better place to ask is in the pull request, and probably only once the PR is merged.