Scheduled weekly dependency update for week 44 (#111)

* Update flake8 from 3.4.1 to 3.5.0

* Update sphinx from 1.6.4 to 1.6.5

* Update aioredis from 0.3.3 to 0.3.4

* Update aiohttp from 2.2.5 to 2.3.1

requirements-dev.txt

@@ -1,14 +1,14 @@
 -e .
-flake8==3.4.1
+flake8==3.5.0
 pytest==3.2.3
 pytest-cov==2.5.1
 coverage==4.4.1
-sphinx==1.6.4
+sphinx==1.6.5
 pep257==0.7.0
 aiohttp-session==1.0.1
 aiopg[sa]==0.13.1
-aioredis==0.3.3
+aioredis==0.3.4
 hiredis==0.2.0
 passlib==1.7.1
-aiohttp==2.2.5
+aiohttp==2.3.1
 pytest-aiohttp==0.1.3