Error installing sidekick from pip

[Chris-May]

I'm pretty sure this is unrelated to #1 .

I just tried pip installing sidekick and got a traceback. the end of which is:

      File "/private/var/folders/n6/m_8w48g17j1_qrdrddl7hdk00000gq/T/pip-install-1z1lhes8/sidekick/src/sidekick/__init__.py", line 16, in <module>
        from .functools import *
      File "/private/var/folders/n6/m_8w48g17j1_qrdrddl7hdk00000gq/T/pip-install-1z1lhes8/sidekick/src/sidekick/functools/__init__.py", line 3, in <module>
        from .composition import *
      File "/private/var/folders/n6/m_8w48g17j1_qrdrddl7hdk00000gq/T/pip-install-1z1lhes8/sidekick/src/sidekick/functools/composition.py", line 3, in <module>
        import toolz
    ModuleNotFoundError: No module named 'toolz'

I don't understand why it's throwing this error, since I see toolz is listed in the pyproject.toml file.

I tried doing this in pip versions 19.0.3 and 19.2.3.