use the same lightning version on Github as in fbcode

Summary: Pull Request resolved: https://github.com/facebookresearch/d2go/pull/183

Reviewed By: zhanghang1989

Differential Revision: D34492204

fbshipit-source-id: 7fd459172e83a5015ca9eee0e2018ce8b22c3096

setup.py

 #!/usr/bin/env python3
 # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
 import glob
-import io
 import os
 import shutil
-import subprocess
 from os import path
 from typing import List
 
@@ -29,7 +27,7 @@ requirements = [
     "Pillow",
     "mock",
     "torch",
-    "pytorch_lightning",
+    "pytorch-lightning @ git+https://github.com/PyTorchLightning/pytorch-lightning.git@86b177ebe",
     "opencv-python",
     "parameterized",
 ]