Docs: update tense
Docs: update tense

pytest 4.6.0 was released in June 2019

https://pypi.org/project/pytest/#history
RonnyPfannschmidt/pytest,nicoddemus/pytest,The-Compiler/pytest,nicoddemus/pytest,pytest-dev/pytest,Akasurde/pytest,alfredodeza/pytest,tomviner/pytest,markshao/pytest,The-Compiler/pytest,tomviner/pytest