Package authors may find this useful, you formerly had to send an email requesting the feature be enabled per repository but now it's available for all. Ref https://github.com/travis-ci/docs-travis-ci-com/commit/8a4efe6e6bfb0dcce760eedabd2ffe640d6545d5
Assuming you're using language: julia in your .travis.yml file, this should be as simple as adding os: - linux - osx
