ci: Remove dead config in .travis.yml (#2585)
ci: Remove dead config in .travis.yml (#2585)

There is no "Saucelabs" stage, and otherwise the "stages" entry just
serve to customize the order of the stages, which does not need to be
customized.
getsentry/raven-js,getsentry/raven-js,getsentry/raven-js,getsentry/raven-js