Only run pylint on 2.7 for simplicity

Author: oschwald

.travis.yml

@@ -22,7 +22,7 @@ before_install:
 script:
   - CFLAGS="-Werror -Wall -Wextra" python setup.py test
   - MAXMINDDB_PURE_PYTHON=1 python setup.py test
-  - if [[ $TRAVIS_PYTHON_VERSION != '3.3' ]]; then pylint --rcfile .pylintrc maxminddb/*.py; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then pylint --rcfile .pylintrc maxminddb/*.py; fi
 
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