Error due to PIP changes in PIP 10.

I had to change this in setup.py:

from pip.req import parse_requirements
To this

    from pip._internal.req import parse_requirements
except ImportError: # for pip <= 9.0.3
    from pip.req import parse_requirements```

[nullpixel]

No longer part of this project, but a relevant PR is #227 - perhaps try that out? This project is considered dead as far as I'm aware anyway.