🐛 Update Python version in example welcome message for Python 3.8 (#186)
🐛 Update Python version in example welcome message for Python 3.8 (#186)

Update Python version to 3.8 for the welcome message in `example-flask-python3.8/app/main.py`
tiangolo/uwsgi-nginx-flask-docker,tiangolo/uwsgi-nginx-flask-docker,tiangolo/uwsgi-nginx-flask-docker