Add new gh webhook?

[bkardell]

I didn't realize that we'd used Travis-ci for this but they changed away from free open source plans https://travis-ci.community/t/org-com-migration-unexpectedly-comes-with-a-plan-change-for-oss-what-exactly-is-the-new-deal/10567/10 and the build has been showing as failing for a really long time because it just doesn't even respond. I removed the webhook for it for now because it is actively misleading and confusing.. It's not failing, it failed when that happened and now it's not even trying. If we want a replacement for it/feel we need it, we can add a different one.