Poetry: Feature request: show dependency graph, like `pipenv graph`

[1ace]

• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] I have searched the documentation and believe that my question is not covered.

Feature Request

pipenv has a neat feature of showing your project's dependency graph via pipenv graph.

Sample output:

$ pipenv graph 
bumpversion==0.5.3
coverage==4.5.1
cycle-calendar-generator==0.1.0
  - ics [required: Any, installed: 0.4]
    - arrow [required: ==0.4.2, installed: 0.4.2]
      - python-dateutil [required: Any, installed: 2.7.3]
        - six [required: >=1.5, installed: 1.11.0]
    - python-dateutil [required: Any, installed: 2.7.3]
      - six [required: >=1.5, installed: 1.11.0]
    - six [required: >1.5, installed: 1.11.0]
  - openpyxl [required: Any, installed: 2.5.8]
    - et-xmlfile [required: Any, installed: 1.0.1]
    - jdcal [required: Any, installed: 1.4]
flake8==3.5.0
  - mccabe [required: >=0.6.0,<0.7.0, installed: 0.6.1]
  - pycodestyle [required: >=2.0.0,<2.4.0, installed: 2.3.1]
  - pyflakes [required: >=1.5.0,<1.7.0, installed: 1.6.0]

It would be great if poetry also had this feature :)

[1ace]

Ah, my bad; I started looking through the code to see if I should write this feature. and I discovered poetry show --tree which is exactly what I was looking for :raised_hands: