Can not be installed with pip in python 3.6

I'm getting this error message when installing in python 3.6 via pip

$ pip install jones-complexity
Collecting jones-complexity
  Using cached https://files.pythonhosted.org/packages/7c/94/e3fc33adcd42cfaf301575c42a9f816aa15b6ccaec8c97d8f6bb089afea7/jones-complexity-0.1.2.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "/tmp/pip-install-i39ubzor/jones-complexity/setup.py", line 14, in <module>
        from pypandoc import convert
    ModuleNotFoundError: No module named 'pypandoc'
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-i39ubzor/jones-complexity/setup.py", line 17, in <module>
        README = open(os.path.join(os.path.dirname(__file__), 'README.md')).read()
    NameError: name 'os' is not defined

Start with setup.py, especially the pypandoc import and the fallback that reads README.md. Reproduce the pip installation under Python 3.6, then verify that the package installs without the reported NameError and that the existing package metadata remains intact.