Merge pull request #458 from python-hyper/requires-io-2.5.X

[requires.io] dependency update on 2.5.X branch

Author: Lukasa

tox.ini

@@ -26,7 +26,7 @@ commands = python -m twisted.trial --reporter=text twisted
 
 [testenv:lint]
 basepython=python3.4
-deps = flake8==3.2.1
+deps = flake8==3.3.0
 commands = flake8 --max-complexity 10 h2 test
 
 [testenv:docs]