remove pipfile to reduce pipenv issues

[KazuCocoa]

When I did a workshop at the AppiumConf 2019, resolve dependencies error happened in pipenv. (Following README)
Once backed to the previous implementation, it resolved.
The guy uses pucyarm etc so maybe some dependencies became conflicted

#376

(update later)

[ki4070ma]

@KazuCocoa

Sorry, might be my mistakes.
If necessary, please try below.

 pip install --user pipenv
 python -m pipenv lock --clear
 python -m pipenv install --dev --system

resolve dependencies error happened in pipenv.

but another error?

[KazuCocoa]

When he ran py.test test/unit, no import httpretty was raised since the command could not resolve dependencies. After running as python -m py.test test/unit, I forgot but another dependencies error raised.

Let me try to reproduce it later...

[VinayakaMayura]

When i try

python -m pipenv lock --clear

It gives below error

Locking [dev-packages] dependencies…
✘ Locking Failed! 
Traceback (most recent call last):
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/resolver.py", line 124, in <module>
    from pipenv.vendor import colorama
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/__init__.py", line 22, in <module>
    from pipenv.vendor.vistir.compat import ResourceWarning, fs_str
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/vendor/vistir/__init__.py", line 18, in <module>
    from .misc import (
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/vendor/vistir/misc.py", line 515, in <module>
    PREFERRED_ENCODING = getpreferredencoding()
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/vendor/vistir/misc.py", line 509, in getpreferredencoding
    _default_encoding = locale.getdefaultlocale()[1]
  File "/Users/vinaymgg/.local/share/virtualenvs/python-client-kx7E6_fq/lib/python2.7/locale.py", line 545, in getdefaultlocale
    return _parse_localename(localename)
  File "/Users/vinaymgg/.local/share/virtualenvs/python-client-kx7E6_fq/lib/python2.7/locale.py", line 477, in _parse_localename
    raise ValueError, 'unknown locale: %s' % localename
ValueError: unknown locale: UTF-8
File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/resolver.py", line 124, in <module>
    from pipenv.vendor import colorama
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/__init__.py", line 22, in <module>
    from pipenv.vendor.vistir.compat import ResourceWarning, fs_str
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/vendor/vistir/__init__.py", line 18, in <module>
    from .misc import (
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/vendor/vistir/misc.py", line 515, in <module>
    PREFERRED_ENCODING = getpreferredencoding()
  File "/Users/vinaymgg/Library/Python/3.7/lib/python/site-packages/pipenv/vendor/vistir/misc.py", line 509, in getpreferredencoding
    _default_encoding = locale.getdefaultlocale()[1]
  File "/Users/vinaymgg/.local/share/virtualenvs/python-client-kx7E6_fq/lib/python2.7/locale.py", line 545, in getdefaultlocale
    return _parse_localename(localename)
  File "/Users/vinaymgg/.local/share/virtualenvs/python-client-kx7E6_fq/lib/python2.7/locale.py", line 477, in _parse_localename
    raise ValueError, 'unknown locale: %s' % localename
ValueError: unknown locale: UTF-8

[mykola-mokhnach]

It's an OSX-specific bug: pypa/pipenv#187

[ki4070ma]

Thanks @mykola-mokhnach

However, we don't expect setting up env has error for contributor.
We can take two options. If no problem, I'll take the former one.

1. Add how to fix to readme
2. Back to the previous style

@KazuCocoa
Do you have any feedbacks to above options from your workshop point of view?
(e.g. too many people had same problem, so simply back to the previous style.)

[mykola-mokhnach]

Lets try with readme first. If still does not work then we always can revert it

[KazuCocoa]

Agree > readme first

@VinayakaMayura Could you try #400 (comment) once on your environment?

[VinayakaMayura]

@KazuCocoa @mykola-mokhnach [#400 ] this works fine

[KazuCocoa]

thanks. We'll add doc in #403 so far

[0mars]

having the same issue ubuntu linux, and none of the solutions work, guess it popped up differently now

 pipenv install           
Pipfile.lock (46359b) out of date, updating to (ed9505)…
Locking [dev-packages] dependencies…
✘ Locking Failed! 
Traceback (most recent call last):
  File "/home/xxx/.local/lib/python3.6/site-packages/pipenv/resolver.py", line 124, in <module>
    from pipenv.vendor import colorama
  File "/home/xxx/workspace/python/xxxx/packages/stars/.venv/lib/python3.7/site-packages/pipenv/__init__.py", line 47, in <module>