An in-range update of async is breaking the build 🚨

## The devDependency [async](https://github.com/caolan/async) was updated from `3.1.1` to `3.2.0`.

🚨 [View failing branch](https://github.com/derhuerst/chatbot-coroutine/compare/master...derhuerst:greenkeeper%2Fasync-3.2.0).

This version is **covered** by your **current version range** and after updating it in your project **the build failed**.

async is a devDependency of this project. It **might not break your production code or affect downstream projects**, but probably breaks your build or test tools, which may **prevent deploying or publishing**.

Status Details

- ❌ **continuous-integration/travis-ci/push:** The Travis CI build could not complete due to an error ([Details](https://travis-ci.org/derhuerst/chatbot-coroutine/builds/654234358?utm_source=github_status&utm_medium=notification)).

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