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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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 decreased (-0.5%) to 62.06% when pulling 892efd3ad37f7c1e78c56f84f4f2107531734578 on greenkeeper/async-3.0.1 into 048718331a6115802ed031154ee83abcd9b4f5ff on master.

[greenkeeper[bot]]

• The dependency async was updated from 2.6.2 to 3.1.0.

Update to this version instead 🚀

[greenkeeper[bot]]

• The dependency async was updated from 2.6.3 to 3.1.1.

Update to this version instead 🚀

[greenkeeper[bot]]

• The dependency async was updated from 2.6.3 to 3.2.0.

Update to this version instead 🚀