chore: release v1.6.4

Co-authored-by: Yoshua Wuyts <yoshuawuyts+github@gmail.com>

Merge pull request async-rs#845 from async-rs/1-6-3

Merge pull request async-rs#814 from async-rs/1-6-1

chore: release v1.6.1

Merge pull request async-rs#794 from async-rs/1-6-0

Merge pull request async-rs#790 from async-rs/1-6-0-beta-2

Merge pull request async-rs#765 from async-rs/feat/1-6-0

V1.5.0 (async-rs#694)

* Update CHANGELOG.md

* v1.5.0

* Update CHANGELOG.md

Merge pull request async-rs#637 from async-rs/v1.4.0

1.4.0

Merge pull request async-rs#617 from async-rs/1.3.0

1.3.0

Bump the version to 1.2.0