Scheduled weekly dependency update for week 11 (#261)

* Update cryptography from 2.1.4 to 2.2

* Update aiohttp from 3.0.7 to 3.0.9

Author: pyup.io bot

requirements-dev.txt

@@ -4,15 +4,15 @@ sphinx==1.7.1
 pep257==0.7.0
 -e .
 aioredis==1.1.0
-cryptography==2.1.4
+cryptography==2.2
 docker==3.1.1
 pynacl==1.2.1
 pytest==3.4.2
 pytest-aiohttp==0.3.0
 pytest-cov==2.5.1
 pytest-mock==1.7.1
 pytest-sugar==0.9.1
-aiohttp==3.0.7
+aiohttp==3.0.9
 multidict==4.1.0
 chardet==3.0.4
 yarl==1.1.1