No longer colorized on Windows

### Issue description

Latest version (`2018.10.9`) of pipenv breaks colorized console output on Windows Powershell (and VS Code)

### Expected result

Colorized output should continue working as in previous version of pipenv

### Actual result

Pipenv colorized output stops immediately upon upgrading to latest pipenv 

### Steps to replicate

(Compare to old pipenv version)

```sh
pip install pipenv==2018.7.1
pipenv
pip install pipenv -U
pipenv
```

![image](https://user-images.githubusercontent.com/13108583/46896544-9441a800-ce4b-11e8-977b-c072bd257cc1.png)

![image](https://user-images.githubusercontent.com/13108583/46897769-dae6d080-ce52-11e8-9f94-69308472b6e9.png)

-------------------------------------------------------------------------------

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2018.10.9'`

Pipenv location: `'c:\\users\\moonb\\miniconda3\\lib\\site-packages\\pipenv'`

Python location: `'c:\\users\\moonb\\miniconda3\\python.exe'`

Python installations found:

  - `4.5.11`: `C:\Users\moonb\Miniconda3\python.exe`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.7.0',
 'os_name': 'nt',
 'platform_machine': 'AMD64',
 'platform_python_implementation': 'CPython',
 'platform_release': '10',
 'platform_system': 'Windows',
 'platform_version': '10.0.17134',
 'python_full_version': '3.7.0',
 'python_version': '3.7',
 'sys_platform': 'win32'}
```

System environment variables:

  - `ALLUSERSPROFILE`
  - `APPDATA`
  - `COMMONPROGRAMFILES`
  - `COMMONPROGRAMFILES(X86)`
  - `COMMONPROGRAMW6432`
  - `COMPUTERNAME`
  - `COMSPEC`
  - `DRIVERDATA`
  - `FPS_BROWSER_APP_PROFILE_STRING`
  - `FPS_BROWSER_USER_PROFILE_STRING`
  - `GOROOT`
  - `HOMEDRIVE`
  - `HOMEPATH`
  - `LOCALAPPDATA`
  - `LOGONSERVER`
  - `NUMBER_OF_PROCESSORS`
  - `OCULUSBASE`
  - `ONEDRIVE`
  - `OS`
  - `PATH`
  - `PATHEXT`
  - `PROCESSOR_ARCHITECTURE`
  - `PROCESSOR_IDENTIFIER`
  - `PROCESSOR_LEVEL`
  - `PROCESSOR_REVISION`
  - `PROGRAMDATA`
  - `PROGRAMFILES`
  - `PROGRAMFILES(X86)`
  - `PROGRAMW6432`
  - `PSMODULEPATH`
  - `PUBLIC`
  - `SESSIONNAME`
  - `SYSTEMDRIVE`
  - `SYSTEMROOT`
  - `TEMP`
  - `TMP`
  - `USERDOMAIN`
  - `USERDOMAIN_ROAMINGPROFILE`
  - `USERNAME`
  - `USERPROFILE`
  - `WINDIR`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_PYTHON_PATH`

Pipenv?specific environment variables:


Debug?specific environment variables:

  - `PATH`: `C:\Program Files\Oculus\Support\oculus-runtime;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Go\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\130\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\130\DTS\Binn\;C:\Program Files\PuTTY\;C:\Users\moonb\AppData\Local\Programs\MiKTeX 2.9\miktex\bin\x64;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\nodejs\;C:\Program Files\Microsoft VS Code\bin;C:\Users\moonb\Miniconda3;C:\Users\moonb\Miniconda3\Scripts;C:\Users\moonb\AppData\Local\Microsoft\WindowsApps;C:\Users\moonb\AppData\Local\atom\bin;C:\Users\moonb\AppData\Local\Microsoft\WindowsApps;C:\Users\moonb\AppData\Local\GitHub\PortableGit_f02737a78695063deace08e96d5042710d3e32db\cmd;C:\Program Files\Microsoft VS Code\bin;C:\Users\moonb\AppData\Local\Pandoc\;C:\Users\moonb\AppData\Local\Programs\MiKTeX 2.9\miktex\bin\x64\;C:\Users\moonb\AppData\Roaming\npm;`


---------------------------

Contents of `Pipfile` ('C:\\Users\\moonb\\Documents\\dev_local\\pipfile-sync\\Pipfile'):

```toml
[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[packages]
toml = "*"

[dev-packages]
"flake8" = "*"
black = ">=stable"
pytest = "*"
coveralls = "*"
pytest-cov = "*"
identify = "*"

[requires]
python_version = "3.7"

[scripts]
format = "black ."
refresh = "pipenv update --dev --clear --verbose"
```


Contents of `Pipfile.lock` ('C:\\Users\\moonb\\Documents\\dev_local\\pipfile-sync\\Pipfile.lock'):

```json
{
    "_meta": {
        "hash": {
            "sha256": "7354451e3ef88bbe14f3cdb2f7219d6bf067d0a200becf034579209171d52a61"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.7"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "toml": {
            "hashes": [
                "sha256:229f81c57791a41d65e399fc06bf0848bab550a9dfd5ed66df18ce5f05e73d5c",
                "sha256:235682dd292d5899d361a811df37e04a8828a5b1da3115886b73cf81ebc9100e"
            ],
            "index": "pypi",
            "version": "==0.10.0"
        }
    },
    "develop": {
        "appdirs": {
            "hashes": [
                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
            ],
            "version": "==1.4.3"
        },
        "atomicwrites": {
            "hashes": [
                "sha256:0312ad34fcad8fac3704d441f7b317e50af620823353ec657a53e981f92920c0",
                "sha256:ec9ae8adaae229e4f8446952d204a3e4b5fdd2d099f9be3aaf556120135fb3ee"
            ],
            "version": "==1.2.1"
        },
        "attrs": {
            "hashes": [
                "sha256:10cbf6e27dbce8c30807caf056c8eb50917e0eaafe86347671b57254006c3e69",
                "sha256:ca4be454458f9dec299268d472aaa5a11f67a4ff70093396e1ceae9c76cf4bbb"
            ],
            "version": "==18.2.0"
        },
        "black": {
            "hashes": [
                "sha256:817243426042db1d36617910df579a54f1afd659adb96fc5032fcf4b36209739",
                "sha256:e030a9a28f542debc08acceb273f228ac422798e5215ba2a791a6ddeaaca22a5"
            ],
            "index": "pypi",
            "version": "==18.9b0"
        },
        "certifi": {
            "hashes": [
                "sha256:376690d6f16d32f9d1fe8932551d80b23e9d393a8578c5633a2ed39a64861638",
                "sha256:456048c7e371c089d0a77a5212fb37a2c2dce1e24146e3b7e0261736aaeaa22a"
            ],
            "version": "==2018.8.24"
        },
        "chardet": {
            "hashes": [
                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
            ],
            "version": "==3.0.4"
        },
        "click": {
            "hashes": [
                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
            ],
            "version": "==7.0"
        },
        "colorama": {
            "hashes": [
                "sha256:a3d89af5db9e9806a779a50296b5fdb466e281147c2c235e8225ecc6dbf7bbf3",
                "sha256:c9b54bebe91a6a803e0772c8561d53f2926bfeb17cd141fbabcb08424086595c"
            ],
            "markers": "sys_platform == 'win32'",
            "version": "==0.4.0"
        },
        "coverage": {
            "hashes": [
                "sha256:03481e81d558d30d230bc12999e3edffe392d244349a90f4ef9b88425fac74ba",
                "sha256:0b136648de27201056c1869a6c0d4e23f464750fd9a9ba9750b8336a244429ed",
                "sha256:10a46017fef60e16694a30627319f38a2b9b52e90182dddb6e37dcdab0f4bf95",
                "sha256:198626739a79b09fa0a2f06e083ffd12eb55449b5f8bfdbeed1df4910b2ca640",
                "sha256:23d341cdd4a0371820eb2b0bd6b88f5003a7438bbedb33688cd33b8eae59affd",
                "sha256:28b2191e7283f4f3568962e373b47ef7f0392993bb6660d079c62bd50fe9d162",
                "sha256:2a5b73210bad5279ddb558d9a2bfedc7f4bf6ad7f3c988641d83c40293deaec1",
                "sha256:2eb564bbf7816a9d68dd3369a510be3327f1c618d2357fa6b1216994c2e3d508",
                "sha256:337ded681dd2ef9ca04ef5d93cfc87e52e09db2594c296b4a0a3662cb1b41249",
                "sha256:3a2184c6d797a125dca8367878d3b9a178b6fdd05fdc2d35d758c3006a1cd694",
                "sha256:3c79a6f7b95751cdebcd9037e4d06f8d5a9b60e4ed0cd231342aa8ad7124882a",
                "sha256:3d72c20bd105022d29b14a7d628462ebdc61de2f303322c0212a054352f3b287",
                "sha256:3eb42bf89a6be7deb64116dd1cc4b08171734d721e7a7e57ad64cc4ef29ed2f1",
                "sha256:4635a184d0bbe537aa185a34193898eee409332a8ccb27eea36f262566585000",
                "sha256:56e448f051a201c5ebbaa86a5efd0ca90d327204d8b059ab25ad0f35fbfd79f1",
                "sha256:5a13ea7911ff5e1796b6d5e4fbbf6952381a611209b736d48e675c2756f3f74e",
                "sha256:69bf008a06b76619d3c3f3b1983f5145c75a305a0fea513aca094cae5c40a8f5",
                "sha256:6bc583dc18d5979dc0f6cec26a8603129de0304d5ae1f17e57a12834e7235062",
                "sha256:701cd6093d63e6b8ad7009d8a92425428bc4d6e7ab8d75efbb665c806c1d79ba",
                "sha256:7608a3dd5d73cb06c531b8925e0ef8d3de31fed2544a7de6c63960a1e73ea4bc",
                "sha256:76ecd006d1d8f739430ec50cc872889af1f9c1b6b8f48e29941814b09b0fd3cc",
                "sha256:7aa36d2b844a3e4a4b356708d79fd2c260281a7390d678a10b91ca595ddc9e99",
                "sha256:7d3f553904b0c5c016d1dad058a7554c7ac4c91a789fca496e7d8347ad040653",
                "sha256:7e1fe19bd6dce69d9fd159d8e4a80a8f52101380d5d3a4d374b6d3eae0e5de9c",
                "sha256:8c3cb8c35ec4d9506979b4cf90ee9918bc2e49f84189d9bf5c36c0c1119c6558",
                "sha256:9d6dd10d49e01571bf6e147d3b505141ffc093a06756c60b053a859cb2128b1f",
                "sha256:be6cfcd8053d13f5f5eeb284aa8a814220c3da1b0078fa859011c7fffd86dab9",
                "sha256:c1bb572fab8208c400adaf06a8133ac0712179a334c09224fb11393e920abcdd",
                "sha256:de4418dadaa1c01d497e539210cb6baa015965526ff5afc078c57ca69160108d",
                "sha256:e05cb4d9aad6233d67e0541caa7e511fa4047ed7750ec2510d466e806e0255d6",
                "sha256:f3f501f345f24383c0000395b26b726e46758b71393267aeae0bd36f8b3ade80"
            ],
            "version": "==4.5.1"
        },
        "coveralls": {
            "hashes": [
                "sha256:ab638e88d38916a6cedbf80a9cd8992d5fa55c77ab755e262e00b36792b7cd6d",
                "sha256:b2388747e2529fa4c669fb1e3e2756e4e07b6ee56c7d9fce05f35ccccc913aa0"
            ],
            "index": "pypi",
            "version": "==1.5.1"
        },
        "docopt": {
            "hashes": [
                "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"
            ],
            "version": "==0.6.2"
        },
        "flake8": {
            "hashes": [
                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0",
                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37"
            ],
            "index": "pypi",
            "version": "==3.5.0"
        },
        "identify": {
            "hashes": [
                "sha256:5e956558a9a1e3b3891d7c6609fc9709657a11878af288ace484d1a46a93922b",
                "sha256:623086059219cc7b86c77a3891f3700cb175d4ce02b8fb8802b047301d71e783"
            ],
            "index": "pypi",
            "version": "==1.1.7"
        },
        "idna": {
            "hashes": [
                "sha256:156a6814fb5ac1fc6850fb002e0852d56c0c8d2531923a51032d1b70760e186e",
                "sha256:684a38a6f903c1d71d6d5fac066b58d7768af4de2b832e426ec79c30daa94a16"
            ],
            "version": "==2.7"
        },
        "mccabe": {
            "hashes": [
                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
            ],
            "version": "==0.6.1"
        },
        "more-itertools": {
            "hashes": [
                "sha256:c187a73da93e7a8acc0001572aebc7e3c69daf7bf6881a2cea10650bd4420092",
                "sha256:c476b5d3a34e12d40130bc2f935028b5f636df8f372dc2c1c01dc19681b2039e",
                "sha256:fcbfeaea0be121980e15bc97b3817b5202ca73d0eae185b4550cbfce2a3ebb3d"
            ],
            "version": "==4.3.0"
        },
        "pluggy": {
            "hashes": [
                "sha256:6e3836e39f4d36ae72840833db137f7b7d35105079aee6ec4a62d9f80d594dd1",
                "sha256:95eb8364a4708392bae89035f45341871286a333f749c3141c20573d2b3876e1"
            ],
            "version": "==0.7.1"
        },
        "py": {
            "hashes": [
                "sha256:bf92637198836372b520efcba9e020c330123be8ce527e535d185ed4b6f45694",
                "sha256:e76826342cefe3c3d5f7e8ee4316b80d1dd8a300781612ddbc765c17ba25a6c6"
            ],
            "version": "==1.7.0"
        },
        "pycodestyle": {
            "hashes": [
                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766",
                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9"
            ],
            "version": "==2.3.1"
        },
        "pyflakes": {
            "hashes": [
                "sha256:08bd6a50edf8cffa9fa09a463063c425ecaaf10d1eb0335a7e8b1401aef89e6f",
                "sha256:8d616a382f243dbf19b54743f280b80198be0bca3a5396f1d2e1fca6223e8805"
            ],
            "version": "==1.6.0"
        },
        "pytest": {
            "hashes": [
                "sha256:7e258ee50338f4e46957f9e09a0f10fb1c2d05493fa901d113a8dafd0790de4e",
                "sha256:9332147e9af2dcf46cd7ceb14d5acadb6564744ddff1fe8c17f0ce60ece7d9a2"
            ],
            "index": "pypi",
            "version": "==3.8.2"
        },
        "pytest-cov": {
            "hashes": [
                "sha256:513c425e931a0344944f84ea47f3956be0e416d95acbd897a44970c8d926d5d7",
                "sha256:e360f048b7dae3f2f2a9a4d067b2dd6b6a015d384d1577c994a43f3f7cbad762"
            ],
            "index": "pypi",
            "version": "==2.6.0"
        },
        "requests": {
            "hashes": [
                "sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1",
                "sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a"
            ],
            "version": "==2.19.1"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        },
        "toml": {
            "hashes": [
                "sha256:229f81c57791a41d65e399fc06bf0848bab550a9dfd5ed66df18ce5f05e73d5c",
                "sha256:235682dd292d5899d361a811df37e04a8828a5b1da3115886b73cf81ebc9100e"
            ],
            "index": "pypi",
            "version": "==0.10.0"
        },
        "urllib3": {
            "hashes": [
                "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",
                "sha256:b5725a0bd4ba422ab0e66e89e030c806576753ea3ee08554382c14e685d117b5"
            ],
            "version": "==1.23"
        }
    }
}

```
</details>



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