More Travis-CI tweakery.

.travis.yml

@@ -1,6 +1,7 @@
 language: python
 python:
  - 2.7
+ - 3.6
 sudo: false
 env:
  - TOX_ENV=py27
@@ -13,7 +14,7 @@ cache:
     - ~/.cache/pip
     - ~/.nvm/nvm.sh
 install:
- - pip install tox
+ - pip install tox tox-travis
  - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash
  - source ~/.nvm/nvm.sh
  - nvm install --lts

tox.ini

@@ -1,7 +1,12 @@
 [tox]
-envlist = py27,py36,lint,docs
+envlist = py{27,36},lint,docs
 skipsdist = True
 
+[travis]
+python=
+  - 2.7: py27,lint,docs
+  - 3.6: py36
+
 [testenv]
 setenv =
     PYTHONPATH={toxinidir}/readthedocs:{toxinidir}