Downgrade docker-py version

RickyCook · RickyCook · commit f67fffa784b8 · 2015-01-07T19:09:00.000+11:00
Fixes: https://trello.com/c/fiVTZCRK/34-bug-docker-build-stream-assertionerror
diff --git a/requirements.txt b/requirements.txt
@@ -1,6 +1,6 @@
 astroid==1.3.2
 blinker==1.3
-docker-py==0.7.0
+docker-py==0.6.0
 Flask-Mail==0.9.1
 Flask==0.10.1
 itsdangerous==0.24
