Update Travis config.

.travis.yml

@@ -1,22 +1,12 @@
 language: python
-python: 2.7
-addons:
-  apt:
-    sources:
-      - deadsnakes # source required so it finds the package definition below
-    packages:
-      - python3.5
-      - python3.5-dev
+python: 3.5
 env:
-    - TOX_ENV=py27
-    - TOX_ENV=py34
     - TOX_ENV=py35
     - TOX_ENV=py35 SERVER=development
-    - TOX_ENV=flake8
 before_install:
-    - VIRTUAL_ENV=.venv make VIRTUALENV="virtualenv --python python3.5" install-dev
-    - VIRTUAL_ENV=.venv make VIRTUALENV="virtualenv --python python3.5" runkinto &
-    - if [[ $SERVER == development ]]; then .venv/bin/pip install https://github.com/Kinto/kinto/tarball/master; fi
+    - make install-dev
+    - make runkinto &
+    - if [[ $SERVER == development ]]; then pip install https://github.com/Kinto/kinto/tarball/master; fi
 install:
     - pip install tox
 script:
@@ -25,3 +15,13 @@ after_success:
     # Report coverage results to coveralls.io
     - pip install coveralls
     - coveralls
+matrix:
+  include:
+    - python: 3.6
+      env: TOX_ENV=py36
+    - python: 3.6
+      env: TOX_ENV=py36 SERVER=development
+    - env:
+        - TOX_ENV=flake8
+      before_install:
+        - python --version