Fix setuptools version for Python 3.4 build on Travis CI

.travis.yml

@@ -11,7 +11,7 @@ matrix:
   - fast_finish: true
 # command to install dependencies
 install:
-  - pip install --upgrade pip
+  - bash -c '[[ $(python -V) == "Python 3.4."* ]] && pip install setuptools==24.0.3 || :'
   - pip install -r requirements.txt
 # command to run tests
 script: