Travis: Move hatchet ci:setup to before_script (#1035)
Travis: Move hatchet ci:setup to before_script (#1035)

So that any failures during `hatchet ci:setup` cause the build to fail
early, rather than try to proceed with running the Hatchet tests.

@W-7929878@

[skip changelog]
AltSchool/heroku-buildpack-python,Scalingo/python-buildpack,Scalingo/python-buildpack,heroku/heroku-buildpack-python,heroku/heroku-buildpack-python,AltSchool/heroku-buildpack-python,skilljar/heroku-buildpack-python