Scheduled weekly dependency update for week 10 (#260)

* Update docker from 3.1.0 to 3.1.1

* Update pytest from 3.4.1 to 3.4.2

* Update aiohttp from 3.0.6 to 3.0.7

Author: pyup.io bot

requirements-dev.txt

@@ -5,14 +5,14 @@ pep257==0.7.0
 -e .
 aioredis==1.1.0
 cryptography==2.1.4
-docker==3.1.0
+docker==3.1.1
 pynacl==1.2.1
-pytest==3.4.1
+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==3.0.6
+aiohttp==3.0.7
 multidict==4.1.0
 chardet==3.0.4
 yarl==1.1.1