GitLab

* [chore] 0.3.1 release

- mainly because vissl needs the new version
- added a doc on release steps

* Update CHANGELOG.md
Co-authored-by: anj-s <32556631+anj-s@users.noreply.github.com>

* review comments
Co-authored-by: anj-s <32556631+anj-s@users.noreply.github.com>

* adding a test to prove the inter operability with upstream pytorch
* updating the changelog
* eager state pruning
* pytorch 1.5 compat

* [test]: test with py39 + torch 1.8 nightly

* version fix

* more fix

* fix version function for nightly version

* fix torch_pg build

* invalidate cache

* separate benchmark requirements

* comment

* fixed mypy

* fixed a test

skip python venv files, and coverage reports

Co-authored-by: Min Xu <m1n@fb.com>