Drop support for PHP < 7.2 and improve test matrix#868

Merged

barryvdh merged 8 commits intobarryvdh:masterfrom mfn:mfn-travis

Jan 2, 2020

+51-25

Commits on Jan 2, 2020

composer: make mockery a root requirement and remove the one from travis
mfn
committed
travis: further improve based on suggestions from https://github.com/fruitcake/laravel-cors/blob/master/.travis.yml
mfn
committed
tests: skip test if mixin markers are already present in model
mfn
committed