Remove unused import

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/476

Removing unused List import from typing

Reviewed By: wat3rBro

Differential Revision: D43358109

fbshipit-source-id: 10d4b2289957657fd17f62b8fea073bb1db6dc10

d2go/config/config.py

@@ -4,7 +4,7 @@
 import contextlib
 import copy
 import logging
-from typing import Dict, List
+from typing import List
 
 import mock
 import yaml