Update babel-preset-airbnb 3.2.1 → 4.0.0
Update babel-preset-airbnb 3.2.1 → 4.0.0

This version adds `@babel/plugin-transform-runtime` to help us reduce
bundle size.

This should have the same effect as
https://github.com/airbnb/react-dates/pull/1689

airbnb/react-dates