Updated promise sorts

Author: syrusakbary

graphql/execution/executor.py

@@ -1,7 +1,6 @@
 import collections
 import functools
 import logging
-
 from promise import Promise, is_thenable, promise_for_dict, promisify
 
 from ..error import GraphQLError

graphql/execution/executors/gevent.py

@@ -1,7 +1,6 @@
 from __future__ import absolute_import
 
 import gevent
-
 from promise import Promise
 
 from .utils import process

graphql/execution/executors/process.py

@@ -1,5 +1,4 @@
 from multiprocessing import Process, Queue
-
 from promise import Promise
 
 from .utils import process

graphql/execution/executors/thread.py

@@ -1,6 +1,5 @@
 from multiprocessing.pool import ThreadPool
 from threading import Thread
-
 from promise import Promise
 
 from .utils import process