Prepare for 2.0.1 release (#78)

General: Prepare for 2.0.0 release (#70)

- Marks the version as "final" in the version markers and changelog.
- Updates the README a little bit.

CI: Roll back actions/upload-artifact to v3 (#62)

For whatever reason, v4 breaks the upload job now. See
actions/upload-artifact#478. I'm just going to
roll it back for the time being and retry the 1.4.0 release.

Bump GitHub Actions Version

Add `pyawaitable_set*` and `pyawaitable_get*` functions (#28)

Needed for [view.py](https://github.com/ZeroIntensity/view.py) to switch
to the PyPI copy instead of a vendor. `set` functions are generally used
for mutating state between calls, while `get` functions are there
because it's kind of weird to have `set` without `get`.

Switch changelog "unreleased" to today. (#24)

Switch changelog unrelease to today.

Stable release

Merge pull request #18 from ZeroIntensity/benchmark

Benchmark

Merge pull request #17 from ZeroIntensity/code-cleanup

Release candidate 1

Update mkdocs.yml