add python 3.5 to travis

.travis.yml

@@ -7,12 +7,13 @@ python:
   - "2.7"
   - "3.3"
   - "3.4"
+  - "3.5"
   - "pypy"
 install:
   - if [[ $TRAVIS_PYTHON_VERSION == 2.6 ]]; then pip install -r py26-requirements.txt; fi
   - pip install -r requirements.txt
-  - pip install pytest-cov --use-mirrors
-  - pip install coveralls --use-mirrors
+  - pip install pytest-cov
+  - pip install coveralls
   #- pip install pytest  # installed by Travis by default already
 script:
   - RUN_SLOW_TESTS_TOO=1 py.test --cov rq