Use python 3.6 for regendoc
Use python 3.6 for regendoc

pytest-dev/pytest,The-Compiler/pytest,The-Compiler/pytest,txomon/pytest,nicoddemus/pytest,tomviner/pytest,hackebrot/pytest,RonnyPfannschmidt/pytest,Akasurde/pytest,markshao/pytest,davidszotten/pytest,nicoddemus/pytest,alfredodeza/pytest,ddboline/pytest,pfctdayelise/pytest,tomviner/pytest