build(deps): bump async from 2.6.3 to 3.2.3

Bumps [async](https://github.com/caolan/async) from 2.6.3 to 3.2.3.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](caolan/async@v2.6.3...v3.2.3)

Closes gh-90

---
updated-dependencies:
- dependency-name: async
  dependency-type: indirect
...

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Author: dependabot[bot]