Merge pull request #16 from aio-libs/pyup-update-pytest-3.0.5-to-3.0.6

Update pytest to 3.0.6

requirements-dev.txt

@@ -1,6 +1,6 @@
 -e .
 flake8==3.2.1
 ipdb==0.10.1
-pytest==3.0.5
+pytest==3.0.6
 pytest-asyncio==0.5.0
 pytest-cov==2.4.0