Bump docker-py version to 3.7.1

This docker-py version includes ssh fixes

Signed-off-by: Ulysses Souza <[email protected]>

requirements.txt

@@ -3,7 +3,7 @@ cached-property==1.3.0
 certifi==2017.4.17
 chardet==3.0.4
 colorama==0.4.0; sys_platform == 'win32'
-docker==3.7.0
+docker==3.7.1
 docker-pycreds==0.4.0
 dockerpty==0.4.1
 docopt==0.6.2