docker.py: remove workaround for old black

Author: manics

repo2docker/docker.py

@@ -61,10 +61,7 @@ def build(
         dockerfile="",
         fileobj=None,
         path="",
-        # fmt: off
-        # black adds a trailing , but this is invalid in Python 3.5
         **kwargs
-        # fmt: on
     ):
         return self._apiclient.build(
             buildargs=buildargs,
@@ -102,10 +99,7 @@ def run(
         publish_all_ports=False,
         remove=False,
         volumes=None,
-        # fmt: off
-        # black adds a trailing , but this is invalid in Python 3.5
         **kwargs
-        # fmt: on
     ):
         client = docker.from_env(version="auto")
         container = client.containers.run(