Support/instructions for Pipx install

[distefam]

I use pipx to manage Python executables on my system and would like to use it to install Sclack. I tried running the following command in Pipx:
pipx install --include-deps --spec git+https://github.com/haskellcamargo/sclack.git sclack which seemed to have worked, however, it installed Sclack as a binary in my path ~/.local/bin named app.py rather than sclack and when I attempt to run app.py (which is exposed on my path) I get the following errors:

Traceback (most recent call last):
  File "/home/michael/.local/bin/app.py", line 14, in <module>
    from sclack.components import Attachment, Channel, ChannelHeader, ChatBox, Dm
  File "/home/michael/.local/pipx/venvs/sclack/lib/python3.7/site-packages/sclack/components.py", line 11, in <module>
    from .markdown import MarkdownText
  File "/home/michael/.local/pipx/venvs/sclack/lib/python3.7/site-packages/sclack/markdown.py", line 3, in <module>
    from .store import Store
  File "/home/michael/.local/pipx/venvs/sclack/lib/python3.7/site-packages/sclack/store.py", line 1, in <module>
    from slackclient import SlackClient
ModuleNotFoundError: No module named 'slackclient'

[FIGBERT]

Seems like this would be fixed by #115 – what's the status on that?