Add from-to parameter to discord message

[SilasPeters]

Previously if we got a discord notification, we could know exactly what was being deployed (unless local files were different from in git, but alas). Currently, with the new from-to functionality, that's not the case.

If a build succeeds now, one might interpret it as everything working okidoki. But if from-to was used, that is only the case for a certain range of roles.

This is just a minor detail and we can never truly trust the discord message, but perhaps adding the --from and --to parameters to the message can be nice. I don't think it's too much work.