Bot should announce in chat when repos are failing

[Fryguy]

I think the bot should monitor Travis repos, and announce failures in gitter chat. In particular, this announcement is important to be cross-repo, so that, say a failure in manageiq/master is announced in the manageiq/ui room.

To avoid slamming the rooms, the bot should announced once on first detection of failure, then announce once that failure is back to green.

[Fryguy]

Might also be helpful to automatically list all PRs merged in the Org since the last green test. Not sure how we would present that in an announcement cause the list could get really big?

[Fryguy]

See also #186

[NickLaMuro]

Took a stab at this here: #469

[miq-bot]

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[Fryguy]

This one now should be reworked to check GitHub Actions instead.