Merge pull request #90 from python-hyper/requires-io-master

[requires.io] dependency update on master branch

Author: Lukasa

test_requirements.txt

@@ -1,3 +1,3 @@
-pytest==3.1.1
+pytest==3.1.2
 pytest-cov==2.5.1
 pytest-xdist==1.16.0