ci: Travis: no coverage by default  [skip appveyor]
ci: Travis: no coverage by default  [skip appveyor]

pytest-dev/pytest,markshao/pytest,nicoddemus/pytest,The-Compiler/pytest,tomviner/pytest,tomviner/pytest,nicoddemus/pytest,Akasurde/pytest,RonnyPfannschmidt/pytest,The-Compiler/pytest,alfredodeza/pytest