Add free lins to match code lint checks

Author: palmkevin

graphene_sqlalchemy/fields.py

@@ -42,10 +42,14 @@ def connection_resolver(cls, resolver, connection, model, root, args, context, i
     def get_resolver(self, parent_resolver):
         return partial(self.connection_resolver, parent_resolver, self.type, self.model)
 
+
 __connectionFactory = SQLAlchemyConnectionField
+
+
 def createConnectionField(_type):
     return __connectionFactory(_type)
 
+
 def registerConnectionFieldFactory(factoryMethod):
     global __connectionFactory
-    __connectionFactory = factoryMethod
+    __connectionFactory = factoryMethod