Update eslint-config-airbnb to the latest version 🚀

[greenkeeper[bot]]

Version 15.0.0 of eslint-config-airbnb just got published.

Dependency	eslint-config-airbnb
Current Version	14.1.0
Type	devDependency

The version 15.0.0 is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of eslint-config-airbnb. Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

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Not sure how things should work exactly?

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html) and of course you may always [ask my humans](https://github.com/greenkeeperio/greenkeeper/issues/new).

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Your Greenkeeper Bot :palm_tree:

[coveralls]

Coverage remained the same at 93.846% when pulling 46ec4af7c8d1f12ad5ef27afd2470a17f5185930 on greenkeeper/eslint-config-airbnb-15.0.0 into 9407bdfec1de423323febac42c16b7f5c7716b1d on master.

[greenkeeper[bot]]

Version 15.0.1 just got published.

Update to this version instead 🚀

[greenkeeper[bot]]

Version 15.0.2 just got published.

Update to this version instead 🚀

[greenkeeper[bot]]

Version 15.1.0 just got published.

Update to this version instead 🚀