Update dependency eslint-config-airbnb to v18

Thalia Technicie
2019-10-08T15:19:19+02:00

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [eslint-config-airbnb](https://github.com/airbnb/javascript) | devDependencies | major | [`17.1.1` -> `18.0.1`](https://renovatebot.com/dif...

eslint-config-airbnb | devDependencies | major | 17.1.1 -> 18.0.1