Update docker from 2.6.1 to 3.1.0

pyup-bot · pyup-bot · commit 2655088074f9 · 2018-03-05T15:09:25.000+02:00
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -5,7 +5,7 @@ aiohttp==3.0.6
 aiomysql==0.0.12
 aiopg==0.13.2
 coverage==4.5.1
-docker==2.6.1
+docker==3.1.0
 docker-compose==1.17.1
 flake8==3.5.0
 ipdb==0.11
