minor: Style and remove unused import.

Author: abawchen

README.md

@@ -35,8 +35,8 @@ from graphene_mongo import MongoengineObjectType
 from .models import User as UserModel
 
 class User(MongoengineObjectType):
-	class Meta:
-		model = UserModel
+    class Meta:
+        model = UserModel
 
 class Query(graphene.ObjectType):
     users = graphene.List(User)

graphene_mongo/tests/test_converter.py

@@ -10,7 +10,6 @@
 from .models import Article, Editor, EmbeddedArticle, Reporter
 
 from ..converter import convert_mongoengine_field
-from ..fields import MongoengineConnectionField
 from ..types import MongoengineObjectType
 
 

graphene_mongo/tests/test_query.py

@@ -5,7 +5,6 @@
 from graphene.relay import Node
 
 from .models import Article, Editor, EmbeddedArticle, Reporter
-from ..fields import MongoengineConnectionField
 from ..types import MongoengineObjectType