update docker-py

Signed-off-by: Jason Ormand <[email protected]>

requirements.txt

@@ -4,7 +4,7 @@ cached-property==1.3.0
 certifi==2017.4.17
 chardet==3.0.4
 colorama==0.4.0; sys_platform == 'win32'
-docker==4.0.1
+docker==4.1.0
 docker-pycreds==0.4.0
 dockerpty==0.4.1
 docopt==0.6.2