show --tree: stop ignoring --no-dev

[1ace]

Pull Request Check List

Resolves: #3295

• Added tests for changed code.
• Updated documentation for changed code. -> not applicable, since we're updating the code to match the documentation :)

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I have tested this with the pyproject.toml from #3295 and it behaves as intended:

$ poetry show --tree --no-dev  # 1.1.4
pytest 6.1.1 pytest: simple powerful testing with Python
├── atomicwrites >=1.0
├── attrs >=17.4.0
├── colorama *
├── iniconfig *
├── packaging *
│   ├── pyparsing >=2.0.2
│   └── six *
├── pluggy >=0.12,<1.0
├── py >=1.8.2
└── toml *
xarray 0.16.1 N-D labeled arrays and datasets in Python
├── numpy >=1.15
└── pandas >=0.25
    ├── numpy >=1.15.4
    ├── python-dateutil >=2.7.3
    │   └── six >=1.5
    └── pytz >=2017.2

$ ~/.bin/poetry show --tree --no-dev  # git version from this PR
xarray 0.16.1 N-D labeled arrays and datasets in Python
├── numpy >=1.15
└── pandas >=0.25
    ├── numpy >=1.15.4
    ├── python-dateutil >=2.7.3
    │   └── six >=1.5
    └── pytz >=2017.2

I tried adding a formal test, but I wouldn't be surprised if I did something wrong as I'm only just discovering the poetry codebase 🙃

You can run the tests on the first commit and see that it fails, and that it passes after the second commit 👍

[kasteph]

Thank you! 💯

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