remove pipenv comparison

[dimbleby]

Remove the pipenv comparison:

• poetry is big enough and mature enough to stand on its own merits, without throwing shade at other projects
• but anyway the worked example is not true any more, pipenv solves the given constraint just fine:

$ pipenv install oslo.utils==1.4.0
Courtesy Notice: Pipenv found itself running within a virtual environment, so it will automatically use that environment, instead of creating its own for any project. You can set PIPENV_IGNORE_VIRTUALENVS=1 to force pipenv to ignore that environment and create its own instead. You can set PIPENV_VERBOSITY=-1 to suppress this warning.
Creating a Pipfile for this project...
Installing oslo.utils==1.4.0...
Adding oslo.utils to Pipfile's [packages]...
✔ Installation Succeeded
Pipfile.lock not found, creating...
Locking [dev-packages] dependencies...
Locking [packages] dependencies...
Building requirements...
Resolving dependencies...
✔ Success!
Updated Pipfile.lock (2b3f82)!
Installing dependencies from Pipfile.lock (2b3f82)...
  🐍   ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 0/0 — 00:00:00
To activate this project's virtualenv, run pipenv shell.
Alternatively, run a command inside the virtualenv with pipenv run.

in particular it finds oslo.i18n 2.1.0, contrary to the README's claim that only poetry is smart enough to do this

[github-actions]

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