Editable with markers cannot be handled correctly by Pipenv

[uranusjr]

This is probably not a problem of Passa, but only a TODO when we eventually integrate Passa into Pipenv.

The problem is that Pipenv passes the line directly to pip, so say if you have

"foo": {
    "editable": true,
    "markers": "os_name == 'nt'",
    "path": "."
}

This becomes -e .; os_name == 'nt', and Pipenv would run pip like this

pip install -e ".; os_name == 'nt'"

The solution is probably to drop the markers completely from the line. They are not needed since Pipenv already evaluates them before running the pip command anyway.

[techalchemy]

investigating why these aren't handled downstream, will update