Update py from 1.6.0 to 1.7.0

Signed-off-by: Sebastien Awwad <sebastien.awwad@gmail.com>

Author: pyup-bot

dev-requirements.txt

@@ -25,7 +25,7 @@ lazy-object-proxy==1.3.1
 mccabe==0.6.1
 pbr==5.1.0
 pluggy==0.8.0
-py==1.6.0
+py==1.7.0
 pycparser==2.19
 pylint==2.1.1 ; python_version >= "3.0"
 pylint==1.9.3 ; python_version < "3.0" # pyup: ignore