DOC remove python2.7 from badge list in README
.. -*- mode: rst -*-
-|Travis|_ |AppVeyor|_ |Codecov|_ |CircleCI|_ |Python27|_ |Python35|_ |PyPi|_ |DOI|_
+|Travis|_ |AppVeyor|_ |Codecov|_ |CircleCI|_ |Python35|_ |PyPi|_ |DOI|_
.. |Travis| image:: https://api.travis-ci.org/scikit-learn/scikit-learn.svg?branch=master
.. _Travis: https://travis-ci.org/scikit-learn/scikit-learn
