Update async to the latest version 🚀

[greenkeeper[bot]]

The dependency async was updated from 2.6.2 to 3.0.1.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Find out more about this release.

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There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).

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Your Greenkeeper bot :palm_tree:

[coveralls]

Coverage increased (+0.2%) to 71.26% when pulling 4e63bdcfdf1b28e27165a4cebe31d31c87b9ccff on greenkeeper/async-3.0.1 into fa50a73b523ed924ef423d8dfed7236a6afb0b31 on dev.

[greenkeeper[bot]]

• The dependency async was updated from 2.6.2 to 3.1.0.

Update to this version instead 🚀