Add webhook to trigger build when new version of ggplot2 passes about ggextra

[crew102]

I did some research on this and I don't think it's possible to trigger based on another users repo...Do you know anyone who might know?

[daattali]

To be honest, I haven't done my research on the topic and I don't know too much about it. Let's see if someone on twitter knows the answer off the top of their heads (I assume they will either have an easy answer or a flat out "no")

https://twitter.com/daattali/status/854069187404288000

[daattali]

Looks like the solution is to use Cron Jobs in travis, to automatically run the tests once per day/week

https://docs.travis-ci.com/user/cron-jobs/

[crew102]

I set this up for my travis account many moons ago and forgot to mention it. I think we can close this.