Run pylint from Travis

Author: oschwald

.travis.yml

@@ -21,6 +21,7 @@ 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 maxminddb; fi
 
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