Upgrades (#475)

* fixed the bug for pypy-5.8.0

* changelog

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* python 2.7.14

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* pipfile > requirements.txt

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* check for python_full_version too

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* 2.7.14

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* warn when using an older version of python

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* requirements for anaconda buildpack

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* remove hashes for conda buildpack

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* improvements to pipenv python version detection

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* oops

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* oops

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* oops

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* echo not puts

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* try this

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* learn more

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* there we go

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* cleanups

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* cleanups

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* cleanups

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* unsupported

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* consistiency

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* be more specific

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* capitalize Pipfile.lock

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* attempt to force color

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* try this

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* try this

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* interactive

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* interactive

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* diagnose

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* try without -l

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* confirmed env working

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* just -c

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* use latest, to debug

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* no more bash

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* try …

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* don't use the git version of pipenv

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* oops

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* next version

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* 2.7.14

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* comment out force color bits

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* readme

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* more tests

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* more tests

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* ellipsis

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