Pipenv fails to install from github by ref and tag

[BeyondEvil]

Trying to install from github using ref and tag fails, because pipenv "destroys" the format of the url removing git: from the reference.

Describe your environment

1. OS Type OSX 10.12.6
2. Python version: $ python -V 3.6.3
3. Pipenv version: $ pipenv --version 8.3.2

Expected result

The reference in Pipfile looks like this (which is correct)
pytest-tags = {git = "git://github.com/Projectplace/pytest-tags.git", editable = true, ref = "1.5"}

But in the Pipfile.lock file, it's
"git": "//github.com/Projectplace/pytest-tags.git"

Workaround is to re-add git: to the pipfile.lock manually.

Actual result

Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Updated Pipfile.lock (24ab2e)!
Installing dependencies from Pipfile.lock (24ab2e)…
  🐍   ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 19/19 — 00:00:05
An error occurred while installing -e git+//github.com/Projectplace/pytest-tags.git@c8cf057c03a1fa30769c0328efa41d4826e03bcf#egg=pytest-tags! Will try again.
Installing initially–failed dependencies…
Obtaining pytest-tags from git+//github.com/Projectplace/pytest-tags.git@c8cf057c03a1fa30769c0328efa41d4826e03bcf#egg=pytest-tags
  Cloning github.com/Projectplace/pytest-tags.git (to c8cf057c03a1fa30769c0328efa41d4826e03bcf) to /Users/jimbrannlund/.local/share/virtualenvs/dpo-automation-NuB7OARD/src/pytest-tags
fatal: repository 'github.com/Projectplace/pytest-tags.git' does not exist

Command "git clone -q github.com/Projectplace/pytest-tags.git /Users/jimbrannlund/.local/share/virtualenvs/dpo-automation-NuB7OARD/src/pytest-tags" failed with error code 128 in None```

[techalchemy]

@BeyondEvil I can reproduce this for editable installs, will look into it

[BeyondEvil]

I have to say, I'm really impressed by the short turnaround (4 hours) from reported issue to merged fix! @techalchemy