Bumps [async](https://github.com/caolan/async) from 1.5.2 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v1.5.2...v2.6.4

)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
...

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