Fix up 3.1 changelog
Fix up 3.1 changelog

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