pipenv article

[Paul W. Frields]

Hi Michal,

The editors want to publish your pipenv article, but we'd like there
to be a little more description of what to do in pipenv.  Also, the
screenshot in the article is illegible and it would help to instead
have this as HTML inside <pre> tags.

Would you be able to add some more content that discusses some of the
most common ways people would make use of pipenv to help with
development?