Finalize CHANGELOG for 3.0.5
Finalize CHANGELOG for 3.0.5

MichaelAquilina/pytest,The-Compiler/pytest,skylarjhdownes/pytest,davidszotten/pytest,txomon/pytest,tomviner/pytest,etataurov/pytest,rmfitzpatrick/pytest,ddboline/pytest,nicoddemus/pytest,flub/pytest,tareqalayan/pytest,alfredodeza/pytest,malinoff/pytest,tomviner/pytest,pfctdayelise/pytest,The-Compiler/pytest,nicoddemus/pytest,RonnyPfannschmidt/pytest,eli-b/pytest,markshao/pytest,hackebrot/pytest,tgoodlet/pytest,vmalloc/dessert,Akasurde/pytest,jaraco/pytest,pytest-dev/pytest