"pip install git-relevant-history" is not working

[Astro03]

I think there are two issues with installing this with pip.

I think you used the old "gitrelevanthistory.py" to create the package but had it pointing to "main.py".

Repro steps

$ python3 -m venv venv               # create a python virtual environment
$ source venv/bin/activate
$ pip3 install git-relevant-history
$ git-relevant-history --help
Traceback (most recent call last):
  File "/usr/local/bin/git-relevant-history", line 5, in <module>
    from gitrelevanthistory import main
ImportError: cannot import name 'main' from 'gitrelevanthistory' (/OBFUSCATED PATH/gitrelevanthistory/__init__.py)
$ mv /OBFUSCATED PATH/gitrelevanthistory/gitrelevanthistory.py /OBFUSCATED PATH/gitrelevanthistory/main.py
$ git-relevant-history --help
Traceback (most recent call last):
  File "/usr/local/bin/git-relevant-history", line 5, in <module>
    from gitrelevanthistory import main
  File "/OBFUSCATED PATH/gitrelevanthistory/main.py", line 33, in <module>
    from docopt import docopt
ModuleNotFoundError: No module named 'docopt' 
$ pip install docopt
$ git-relevant-history --help         # works

Also, is it typical that we need to install docopt ourselves or should it automatically have been installed?