Update docker from 2.7.0 to 3.3.0 (#469)

pyup.io bot · jettify · commit b5327c2585f6 · 2018-04-30T22:54:41.000+03:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 coverage==4.4.2
-docker==2.7.0
+docker==3.3.0
 ipdb==0.11
 ipython==6.2.1
 flake8==3.4.1
