Add python 3.8
Add python 3.8

polyfunc/flask-todolist,0xfoo/flask-todolist,rtzll/flask-todolist,0xfoo/flask-todolist,rtzll/flask-todolist,rtzll/flask-todolist,polyfunc/flask-todolist,polyfunc/flask-todolist,0xfoo/flask-todolist,rtzll/flask-todolist