update changelog (#486)

* fixed the bug for pypy-5.8.0

* changelog
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* python 2.7.14
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* pipfile > requirements.txt
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* check for python_full_version too
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* 2.7.14
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* warn when using an older version of python
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* requirements for anaconda buildpack
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* remove hashes for conda buildpack
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* improvements to pipenv python version detection
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* 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
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* comment out force color bits
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* readme
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* more tests
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* more tests
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* ellipsis
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* Merge branch 'master' of github.com:heroku/heroku-buildpack-python

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
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* changelog
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CHANGELOG.md

 # Python Buildpack Changelog
 
+# 121
+
+Update default Python to v3.6.3.
+
+# 120
+
+Use Pipenv --deploy.
+
 # 119
 
 Improvements to Pipenv support, warning on unsupported Python versions.