py.typed marker not shipped in the published artefacts

[EricHripko]

Hey! We noticed that whilst py.typed marker is included in the source, it appears to be missing from published artefacts. This means that callers that adopted mypy aren't benefitting from type checking and have to add github3 dependency to the type ignore list. Would it be possible to include the marker if this library is indeed typed?

[EricHripko]

It seems like this'd be fixed if a release is cut off the default branch 👀