[BugFix] Add setuptools upgrade (#374)

.travis.yml

@@ -8,6 +8,7 @@ install:
   - pip install coverage
   - pip install flake8 pytest PyYAML
   - pip install coveralls
+  - pip install setuptools --upgrade
 script:
   - flake8 ./ || travis_terminate 1;
   - python setup.py test || travis_terminate 1;