Commit bf378916 authored by Committed by Kenneth Reitz
Speed up the multi-stage Travis run (#443)
Reduces the impact on Travis runtime caused by #438, by: * Making the shellcheck job run on the container infra (`sudo: false`) which has faster boot times. * Running the heroku-16 and cedar-14 stack tests in parallel, since previously they were separate stages (which are run in series by design). Reduces Travis end-to-end time from ~10 minutes to ~6 minutes.
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