Improve CHANGELOG grammar
Improve CHANGELOG grammar

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