Flake8 improvements and README update

Author: syrusakbary

README.rst

@@ -12,7 +12,9 @@ easily.
    `Django <http://github.com/graphql-python/swapi-graphene>`__
    implementation
 
-*What is supported in this Python version?* **Everything**: Interfaces, ObjectTypes, Scalars, Unions and Relay (Nodes, Connections and Mutations), in addition to queries, mutations and subscriptions.
+*What is supported in this Python version?* **Everything**: Interfaces,
+ObjectTypes, Scalars, Unions and Relay (Nodes, Connections), in addition
+to queries, mutations and subscriptions.
 
 Installation
 ------------

graphene/contrib/django/tests/test_types.py

@@ -1,6 +1,6 @@
-from pytest import raises
 from graphql.core.type import GraphQLInterfaceType, GraphQLObjectType
 from mock import patch
+from pytest import raises
 
 from graphene import Schema
 from graphene.contrib.django.types import DjangoInterface, DjangoNode

graphene/relay/tests/test_types.py

@@ -1,5 +1,5 @@
-from pytest import raises
 from graphql.core.type import GraphQLList
+from pytest import raises
 
 import graphene
 from graphene import relay