reverse the order of python versions in test

Author: chfw

.travis.yml

@@ -3,13 +3,13 @@ language: python
 notifications:
   email: false
 python:
-  - pypy
-  - 2.6
-  - 2.7
-  - 3.3
-  - 3.4
-  - 3.5
   - 3.6
+  - 3.5
+  - 3.4
+  - 3.3
+  - 2.7
+  - 2.6
+  - pypy
 before_install:
   - if [[ $TRAVIS_PYTHON_VERSION == "2.6" ]]; then pip install flake8==2.6.2; fi
   - if [[ -f min_requirements.txt && "$MINREQ" -eq 1 ]]; then