Scheduled weekly dependency update for week 23 (#166)

* Update pytest from 3.5.1 to 3.6.1

* Update sphinx from 1.7.4 to 1.7.5

* Update aiohttp from 3.2.1 to 3.3.1

* Update pyjwt from 1.6.3 to 1.6.4

requirements-dev.txt

@@ -1,10 +1,10 @@
 -e .
 flake8==3.5.0
-pytest==3.5.1
+pytest==3.6.1
 pytest-cov==2.5.1
 pytest-mock==1.10.0
 coverage==4.5.1
-sphinx==1.7.4
+sphinx==1.7.5
 pep257==0.7.0
 aiohttp-session==2.5.1
 aiopg[sa]==0.14.0
@@ -12,6 +12,6 @@ aioredis==1.1.0
 hiredis==0.2.0
 passlib==1.7.1
 cryptography==2.2.2
-aiohttp==3.2.1
+aiohttp==3.3.1
 pytest-aiohttp==0.3.0
-pyjwt==1.6.3
+pyjwt==1.6.4