Added explicit setuptools installation to handle a bug in the Python 3.4 Travis image, mentioned [here](tox-dev/tox-travis#76).

afiorillo · afiorillo · commit 5f5772f7107d · 2018-09-03T14:44:45.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -22,6 +22,7 @@ before_install:
     - "tar -xzvf nltk_data.tar.gz -C ~"
 
 install:
+  - pip install -r requirements-tests.txt
   - pip install -U .
 
 script: python run_tests.py
diff --git a/requirements-tests.txt b/requirements-tests.txt
@@ -1,3 +1,4 @@
+setuptools>=36.0.0
 pep8==1.5.7
 autopep8
 flake
