Pipfile able to build in version 2018.05.18 but not in latest.

##### Issue description

In my company we've been for quite some time freezing pipenv to version 2018.05.18 because after upgrading dependencies couldn't be resolved. After some research I found the minimal Pipfile that provokes the error, which can be found below:

```toml
[[source]]
url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"

[requires]
python_version = "3.5.2"

[packages]
django = ">=1.11, <2.0"
django-tastypie-oauth = {editable = true, ref = "master", git = "https://github.com/orcasgit/django-tastypie-oauth"}
django-tastypie = ">=0.14.0, <1.0.0"
django-oauth-toolkit = "<1.0.0"
```

When running with pipenv 2018.05.18 everything works fine, but with the latest version I have this error:

```
$ pipenv lock
Locking [dev-packages] dependencies...
Locking [packages] dependencies...

Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
  You can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
  Hint: try $ pipenv lock --pre if it is a pre-release dependency.
Could not find a version that matches django<2.0,==1.11.15,>=1.11,>=1.8,>=2.0 (from -r /var/folders/kp/kphh92w93890dzf4qp72xrvh0000gn/T/pipenv-_qlyg0sb-requirements/pipenv-jwhyow79-constraints.txt (line 5))
Tried: 1.1.3, 1.1.4, 1.2, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 1.2.7, 1.3, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.4, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.4.6, 1.4.7, 1.4.8, 1.4.9, 1.4.10, 1.4.11, 1.4.12, 1.4.13, 1.4.14, 1.4.15, 1.4.16, 1.4.17, 1.4.18, 1.4.19, 1.4.20, 1.4.21, 1.4.22, 1.5, 1.5.1, 1.5.2, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 1.5.7, 1.5.8, 1.5.8, 1.5.9, 1.5.10, 1.5.11, 1.5.12, 1.5.12, 1.6, 1.6, 1.6.1, 1.6.1, 1.6.2, 1.6.2, 1.6.3, 1.6.3, 1.6.4, 1.6.4, 1.6.5, 1.6.5, 1.6.6, 1.6.6, 1.6.7, 1.6.7, 1.6.8, 1.6.8, 1.6.9, 1.6.9, 1.6.10, 1.6.10, 1.6.11, 1.6.11, 1.7, 1.7, 1.7.1, 1.7.1, 1.7.2, 1.7.2, 1.7.3, 1.7.3, 1.7.4, 1.7.4, 1.7.5, 1.7.5, 1.7.6, 1.7.6, 1.7.7, 1.7.7, 1.7.8, 1.7.8, 1.7.9, 1.7.9, 1.7.10, 1.7.10, 1.7.11, 1.7.11, 1.8, 1.8, 1.8.1, 1.8.1, 1.8.2, 1.8.2, 1.8.3, 1.8.3, 1.8.4, 1.8.4, 1.8.5, 1.8.5, 1.8.6, 1.8.6, 1.8.7, 1.8.7, 1.8.8, 1.8.8, 1.8.9, 1.8.9, 1.8.10, 1.8.10, 1.8.11, 1.8.11, 1.8.12, 1.8.12, 1.8.13, 1.8.13, 1.8.14, 1.8.14, 1.8.15, 1.8.15, 1.8.16, 1.8.16, 1.8.17, 1.8.17, 1.8.18, 1.8.18, 1.8.19, 1.8.19, 1.9, 1.9, 1.9.1, 1.9.1, 1.9.2, 1.9.2, 1.9.3, 1.9.3, 1.9.4, 1.9.4, 1.9.5, 1.9.5, 1.9.6, 1.9.6, 1.9.7, 1.9.7, 1.9.8, 1.9.8, 1.9.9, 1.9.9, 1.9.10, 1.9.10, 1.9.11, 1.9.11, 1.9.12, 1.9.12, 1.9.13, 1.9.13, 1.10, 1.10, 1.10.1, 1.10.1, 1.10.2, 1.10.2, 1.10.3, 1.10.3, 1.10.4, 1.10.4, 1.10.5, 1.10.5, 1.10.6, 1.10.6, 1.10.7, 1.10.7, 1.10.8, 1.10.8, 1.11, 1.11, 1.11.1, 1.11.1, 1.11.2, 1.11.2, 1.11.3, 1.11.3, 1.11.4, 1.11.4, 1.11.5, 1.11.5, 1.11.6, 1.11.6, 1.11.7, 1.11.7, 1.11.8, 1.11.8, 1.11.9, 1.11.9, 1.11.10, 1.11.10, 1.11.11, 1.11.11, 1.11.12, 1.11.12, 1.11.13, 1.11.13, 1.11.14, 1.11.14, 1.11.15, 1.11.15, 2.0, 2.0, 2.0.1, 2.0.1, 2.0.2, 2.0.2, 2.0.3, 2.0.3, 2.0.4, 2.0.4, 2.0.5, 2.0.5, 2.0.6, 2.0.6, 2.0.7, 2.0.7, 2.0.8, 2.0.8, 2.1, 2.1, 2.1.1, 2.1.1
Skipped pre-versions: 1.8a1, 1.8b1, 1.8b2, 1.8rc1, 1.9a1, 1.9b1, 1.9rc1, 1.9rc2, 1.10a1, 1.10a1, 1.10b1, 1.10b1, 1.10rc1, 1.10rc1, 1.11a1, 1.11b1, 1.11rc1, 1.11rc1, 2.0a1, 2.0b1, 2.0rc1, 2.1a1, 2.1b1, 2.1rc1
There are incompatible versions in the resolved dependencies.
```
##### Expected result

To be able to lock dependencies as in version 2018.05.18.

##### Actual result

No dependencies locked.

##### Steps to replicate

Using the provided Pipfile switch from version 2018.05.18 to the latest and execute `pipenv lock`.

-------------------------------------------------------------------------------

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2018.7.1'`

Pipenv location: `'/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/lib/python3.5/site-packages/pipenv'`

Python location: `'/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/bin/python3.5'`

Other Python installations in `PATH`:

  - `2.7`: `/usr/local/bin/python2.7`
  - `2.7`: `/usr/local/Cellar/pyenv/1.2.3/shims/python2.7`
  - `2.7`: `/usr/local/bin/python2.7`
  - `2.7`: `/usr/bin/python2.7`
  - `3.5`: `/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/bin/python3.5m`
  - `3.5`: `/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/bin/python3.5`
  - `3.5`: `/usr/local/Cellar/pyenv/1.2.3/shims/python3.5`
  - `3.6`: `/usr/local/Cellar/pyenv/1.2.3/shims/python3.6`

  - `3.5.2`: `/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/bin/python`
  - `3.5.2`: `/usr/local/Cellar/pyenv/1.2.3/shims/python`
  - `2.7.14`: `/usr/local/bin/python`
  - `2.7.10`: `/usr/bin/python`
  - `None`: `/usr/local/Cellar/pyenv/1.2.3/shims/python2`
  - `2.7.14`: `/usr/local/bin/python2`
  - `3.5.2`: `/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/bin/python3`
  - `3.5.2`: `/usr/local/Cellar/pyenv/1.2.3/shims/python3`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.5.2',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '17.7.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT '
                     '2018; root:xnu-4570.71.2~1/RELEASE_X86_64',
 'python_full_version': '3.5.2',
 'python_version': '3.5',
 'sys_platform': 'darwin'}
```

System environment variables:

  - `HOME`
  - `LC_CTYPE`
  - `PWD`
  - `PYTHONDONTWRITEBYTECODE`
  - `LOGNAME`
  - `LESS`
  - `PYENV_ROOT`
  - `PYENV_SHELL`
  - `PATH`
  - `XPC_SERVICE_NAME`
  - `NVM_BIN`
  - `NVM_DIR`
  - `COLORTERM`
  - `USER`
  - `SHELL`
  - `TERM`
  - `TERM_PROGRAM_VERSION`
  - `TERM_PROGRAM`
  - `ITERM_PROFILE`
  - `COLORFGBG`
  - `SHLVL`
  - `PYENV_HOOK_PATH`
  - `ZSH`
  - `XPC_FLAGS`
  - `Apple_PubSub_Socket_Render`
  - `LANG`
  - `ITERM_SESSION_ID`
  - `LSCOLORS`
  - `TERM_SESSION_ID`
  - `PYENV_DIR`
  - `PYENV_VERSION`
  - `TMPDIR`
  - `PIP_PYTHON_PATH`
  - `LC_ALL`
  - `GEM_HOME`
  - `SSH_AUTH_SOCK`
  - `PAGER`
  - `__CF_USER_TEXT_ENCODING`
  - `NVM_CD_FLAGS`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `/usr/local/Cellar/pyenv/1.2.3/versions/3.5.2/bin:/usr/local/Cellar/pyenv/1.2.4/libexec:/usr/local/Cellar/pyenv/1.2.3/plugins/python-build/bin:/Users/molina/.yarn/bin:/Users/molina/.config/yarn/global/node_modules/.bin:/Users/molina/.gem/bin:/usr/local/Cellar/pyenv/1.2.3/shims:/Users/molina/.nvm/versions/node/v9.5.0/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/MacGPG2/bin`
  - `SHELL`: `/bin/zsh`
  - `LANG`: `en_US.UTF-8`
  - `PWD`: `/Users/molina/workspace/bity-backend`


---------------------------

Contents of `Pipfile` ('/Users/molina/workspace/bity-backend/Pipfile'):

```toml
[[source]]
url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"

[requires]
python_version = "3.5.2"

[packages]
django = ">=1.11, <2.0"
django-tastypie-oauth = {editable = true, ref = "master", git = "https://github.com/orcasgit/django-tastypie-oauth"}
django-tastypie = ">=0.14.0, <1.0.0"
django-oauth-toolkit = "<1.0.0"

```


Contents of `Pipfile.lock` ('/Users/molina/workspace/bity-backend/Pipfile.lock'):

```json
{
    "_meta": {
        "hash": {
            "sha256": "9127b5d027adaced4b47274103a9d77c62c43bcdda6842c9c6195e986355363a"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.5.2"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.python.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "django": {
            "hashes": [
                "sha256:8176ac7985fe6737ce3d6b2531b4a2453cb7c3377c9db00bacb2b3320f4a1311",
                "sha256:b18235d82426f09733d2de9910cee975cf52ff05e5f836681eb957d105a05a40"
            ],
            "index": "pypi",
            "version": "==1.11.15"
        },
        "django-braces": {
            "hashes": [
                "sha256:a457d74ea29478123c0c4652272681b3cea0bf1232187fd9f9b6f1d97d32a890",
                "sha256:ba68e98b817c6f01d71d10849f359979617b3fe4cefb7f289adefddced092ddc"
            ],
            "version": "==1.13.0"
        },
        "django-oauth-toolkit": {
            "hashes": [
                "sha256:4e50e6e4ba59bc09502ee39d7e7ad8f14e1fe1e15f93e7f4422791c9ecc3b1e0",
                "sha256:7b368b6440c7c0bb5f9fe00e6a81e7bcee46d399e7f831f91e9cb15afcb77770"
            ],
            "index": "pypi",
            "version": "==0.12.0"
        },
        "django-tastypie": {
            "hashes": [
                "sha256:a3a2413510009649e0eac885ead96891c783ced788fd94231dc2f72b7a1b4c04"
            ],
            "index": "pypi",
            "version": "==0.14.2"
        },
        "django-tastypie-oauth": {
            "editable": true,
            "git": "https://github.com/orcasgit/django-tastypie-oauth",
            "ref": "master"
        },
        "oauthlib": {
            "hashes": [
                "sha256:132ad46df25e53a84b33f1fd43f80e973cda2cb018cc0168d7d0c8c4d5cef9b5"
            ],
            "version": "==2.0.1"
        },
        "python-dateutil": {
            "hashes": [
                "sha256:1adb80e7a782c12e52ef9a8182bebeb73f1d7e24e374397af06fb4956c8dc5c0",
                "sha256:e27001de32f627c22380a688bcc43ce83504a7bc5da472209b4c70f02829f0b8"
            ],
            "version": "==2.7.3"
        },
        "python-mimeparse": {
            "hashes": [
                "sha256:76e4b03d700a641fd7761d3cd4fdbbdcd787eade1ebfac43f877016328334f78",
                "sha256:a295f03ff20341491bfe4717a39cd0a8cc9afad619ba44b77e86b0ab8a2b8282"
            ],
            "version": "==1.6.0"
        },
        "pytz": {
            "hashes": [
                "sha256:a061aa0a9e06881eb8b3b2b43f05b9439d6583c206d0a6c340ff72a7b6669053",
                "sha256:ffb9ef1de172603304d9d2819af6f5ece76f2e85ec10692a524dd876e72bf277"
            ],
            "version": "==2018.5"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        }
    },
    "develop": {}
}

```
</details>


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Pipfile able to build in version 2018.05.18 but not in latest. #2894

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