Add Python 3.6

Plus Travis CI typo

docs/developer.rst

@@ -14,7 +14,7 @@ conditions of the :ref:`Expat license <license>`.  Fork away!
 * `Source code <https://github.com/pycqa/pycodestyle>`_ and
   `issue tracker <https://github.com/pycqa/pycodestyle/issues>`_ on GitHub.
 * `Continuous tests <http://travis-ci.org/pycqa/pycodestyle>`_ against Python
-  2.6 through 3.5 as well as the nightly Python build and PyPy, on `Travis-CI
+  2.6 through 3.6 as well as the nightly Python build and PyPy, on `Travis CI
   platform <https://docs.travis-ci.com//>`_.
 .. _available on GitHub: https://github.com/pycqa/pycodestyle
@@ -104,7 +104,7 @@ Then be sure to pass the tests::
 When contributing to pycodestyle, please observe our `Code of Conduct`_.
-To run the tests, the core developer team and Travis-CI use tox::
+To run the tests, the core developer team and Travis CI use tox::
     $ pip install -r dev-requirements.txt
     $ tox