Update babel monorepo

Thalia Technicie
2019-10-08T15:19:20+02:00

This MR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [@babel/plugin-proposal-optional-chaining](https://github.com/babel/babel) | devDependencies | minor | [`7.2.0` -> `7.6.0`](https://renovat...

@babel/plugin-proposal-optional-chaining | devDependencies | minor | 7.2.0 -> 7.6.0
@babel/plugin-transform-runtime | devDependencies | minor | 7.5.5 -> 7.6.2
@babel/preset-env (source) | devDependencies | minor | 7.5.5 -> 7.6.2

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