AsyncIO only prints the single url

The https://www.jython.org url is never downloaded based on what is printed out

Steps to recreate:

git clone git@github.com:realpython/materials.git real_python_materials
cd real_python_materials/
python3.6 -m venv 36env
source 36env/bin/activate
pip install aiohttp

Running the script:

python io_asyncio.py 
Read 273 from http://olympus.realpython.org/dice
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Downloaded 160 sites in 3.151465892791748 seconds

Chạy python io_asyncio.py theo các bước tái hiện và kiểm tra io_asyncio.py, tập trung vào cách các URL được lên lịch và báo cáo. Xác minh rằng https://www.jython.org thực sự được tải xuống, thay vì chỉ tải xuống URL http://olympus.realpython.org/dice lặp lại. Hoàn tất khi đầu ra phản ánh các lượt tải xuống từ tập hợp trang web dự kiến.