Merge branch 'master' of github.com:heroku/heroku-buildpack-python

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

CHANGELOG.md

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