Deprecating python 3.6 (#70325)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/70457
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70325
Reviewed By: seemethere
Differential Revision: D33339496
Pulled By: atalman
fbshipit-source-id: 7509cab4f7469dae234bcf3f79e0aabb54577b8a
