Add Kyle Altendorf to AUTHORS
Add Kyle Altendorf to AUTHORS

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