No matching distribution found for cattrs-3.8==0.9.0 #101

According to the package's release history on PyPI, the package cattrs-3.8 doesn't have a 0.9.0 version.

~/Desktop/DeleteFB
venv ❯ pip3 install -r requirements.txt
Requirement already satisfied: attrs==19.1.0 in ./venv/lib/python3.7/site-packages (from -r requirements.txt (line 1)) (19.1.0)
Requirement already satisfied: bitarray==0.9.3 in ./venv/lib/python3.7/site-packages (from -r requirements.txt (line 2)) (0.9.3)
Requirement already satisfied: bleach==3.1.0 in ./venv/lib/python3.7/site-packages (from -r requirements.txt (line 3)) (3.1.0)
ERROR: Could not find a version that satisfies the requirement cattrs-3.8==0.9.0 (from -r requirements.txt (line 4)) (from versions: 0.9.1)
ERROR: No matching distribution found for cattrs-3.8==0.9.0 (from -r requirements.txt (line 4))

For what it's worth, the cattrs-3.8 package was added as a workaround for another bug where cattrs doesn't support Python 3.8. So maybe there's a better solution than using this package.

Yeah I'm pretty sure there are enough other utility tools that will provide the same functionality. Not sure if they won't suffer from a problem similar to the cattrs issue.