Publication date: 2019-05-03
salt-ssh (2018.3.3) using pip shows "AttributeError: type object 'InstallRequirement' has no attribute 'from_line'".
This is fixed in version 2018.3.4. Alternatively, you can downgrade pip to v18.
I upgraded towards newer salt-ssh on my Alpine Linux machine:
apk del salt*
pip3 install salt-ssh