remove isort config, flake8 comments

.isort.cfg

@@ -1,2 +0,0 @@
-[settings]
-known_third_party = graphql,graphql_relay,promise,pytest,pyutils,setuptools,snapshottest,sphinx_graphene_theme

graphene/types/__init__.py

@@ -1,4 +1,3 @@
-# flake8: noqa
 from graphql import GraphQLResolveInfo as ResolveInfo
 
 from .argument import Argument

graphene/utils/dataloader.py

@@ -9,7 +9,7 @@ from collections import namedtuple
 from collections.abc import Iterable
 from functools import partial
 
-from typing import List  # flake8: noqa
+from typing import List
 
 Loader = namedtuple("Loader", "key,future")