add docs to travis builds

Michael Merickel

2015-11-26 7bff4877ab3b2afad421d96725a41bef0dd40e5a

add docs to travis builds

 .travis.yml

@@ -22,6 +22,10 @@
          env: TOXENV=pypy3
        - python: 3.5
          env: TOXENV=py2-cover,py3-cover,coverage
        - python: 3.5
          env: TOXENV=docs
        - python: 3.5
          env: TOXENV=pep8

install:
  - travis_retry pip install tox