Scheduled weekly dependency update for week 22 (#290)

* Update sphinx from 1.7.4 to 1.7.5

* Update aiohttp from 3.2.1 to 3.3.0

Author: pyup.io bot

requirements-dev.txt

@@ -1,6 +1,6 @@
 attrs==18.1.0
 flake8==3.5.0
-sphinx==1.7.4
+sphinx==1.7.5
 pep257==0.7.0
 -e .
 aioredis==1.1.0
@@ -12,7 +12,7 @@ pytest-aiohttp==0.3.0
 pytest-cov==2.5.1
 pytest-mock==1.10.0
 pytest-sugar==0.9.1
-aiohttp==3.2.1
+aiohttp==3.3.0
 multidict==4.3.0
 chardet==3.0.4
 yarl==1.2.4