Instructions to upgrade to Python 3.8

1. Run

find . -type f -name "*.py" -exec sed -i'' -e 's/asyncio.Task.current_task/asyncio.current_task/g' {} +

This is related to the deprecation in Python 3.7: https://docs.python.org/3/whatsnew/3.7.html (on asyncio.current_task())

2. Update pyproject.toml to bump the minimum Python version to 3.8