Fix Python matrix for travis-ci

refs #252

.travis.yml

@@ -1,18 +1,26 @@
+sudo: false
 language: python
-python: 2.7
-env:
-    - TOX_ENV=py27
-    - TOX_ENV=py34
-    - TOX_ENV=py35
-    - TOX_ENV=flake8
-script: tox -e $TOX_ENV
 install:
     - pip install tox
+
+script:
+    - tox -e $TOXENV
+
 matrix:
+  fast_finish: true
   include:
+    # Python version is just for the look on travis.
+    - python: 2.7
+      env: TOXENV=py27
+
+    - python: 3.4
+      env: TOXENV=py34
+
+    - python: 3.5
+      env: TOXENV=py35
+
     - python: 3.6
-      env:
-        - TOX_ENV=py36
+      env: TOXENV=py36
+
     - python: 3.6
-      env:
-        - TOX_ENV=flake8
+      env: TOXENV=flake8

CHANGELOG

@@ -5,6 +5,7 @@ master (unreleased)
 -------------------
 
 - Dropped support for Python 3.3 (#245).
+- Fixed Travis-ci configuration for Python 3.5 and al (#252).
 
 2.3.1 (2017-07-27)
 ------------------