doc: readme revision (#57)

To reflect changes made in v0.1.0, the top-level README.md is revised.
Also, the description for examples is updated to highlight that the
multiworld examples are fault-tolerant.

release: version bump-up to 0.0.4 (#24)

The version is now set to v0.0.4.

patch: pytorch patch revision for multiworld (#18)

Some files were not patched in the previous PR. This causes errors
when other parts of torch.distributed are loaded. We handle the issues
with the additional patch.

misc: v0.0.2 (#17)

The version is bumped up to 0.0.2.

misc: pypi workflow update (#13)

pypi publishing workflow has been revised. We revise it based on

https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows.