This is what I did, following the suggestions for upgrades:
pip3 install -r requirements.txt
And this is the error I'm stuck with now:
ERROR: Could not find a version that satisfies the requirement requests-html==0.10.0 (from -r requirements.txt (line 1)) (from versions: 0.0.1, 0.1.0, 0.1.1, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.4.0, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4, 0.6.5, 0.6.6)
ERROR: No matching distribution found for requests-html==0.10.0 (from -r requirements.txt (line 1))
That's the only thing I ran and it worked.