Update eslint-config-airbnb to the latest version 🚀#4

greenkeeper[bot] wants to merge 2 commits intomasterthe-road-to-learn-react/use-custom-element:masterfrom

greenkeeper/eslint-config-airbnb-18.0.0the-road-to-learn-react/use-custom-element:greenkeeper/eslint-config-airbnb-18.0.0Copy head branch name to clipboard