Re-add blinker for testing (Flask-Testing)
Re-add blinker for testing (Flask-Testing)

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