test(pylint): change pylint to 2.7

Author: ehdsouza

.travis.yml

@@ -10,9 +10,6 @@ matrix:
       dist: xenial  # required for Python >= 3.7 (travis-ci/travis-ci#9069)
 cache: pip
 before_install:
-# try a workaround to avoid BlockingIOError on Travis-CI for python 3.7. See
-# https://github.com/travis-ci/travis-ci/issues/8920#issuecomment-352767521
-- python -c "import fcntl; fcntl.fcntl(1, fcntl.F_SETFL, 0)"
 - '[ "${TRAVIS_PULL_REQUEST}" = "false" ] && openssl aes-256-cbc -K $encrypted_cebf25e6c525_key
   -iv $encrypted_cebf25e6c525_iv -in .env.enc -out .env -d || true'
 - npm install npm@latest -g

tox.ini

@@ -2,7 +2,7 @@
 envlist = lint, py27, py34, py35, py36, py37
 
 [testenv:lint]
-basepython = python3.7
+basepython = python2.7
 deps = pylint
 commands = pylint watson_developer_cloud test examples