chore(deps): update dependency @babel/core to v7.6.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@babel/core (source)	devDependencies	patch	7.6.3 -> 7.6.4

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Release Notes

babel/babel

### [`v7.6.4`](https://togithub.com/babel/babel/blob/master/CHANGELOG.md#v764-2019-10-10) [Compare Source](https://togithub.com/babel/babel/compare/v7.6.3...v7.6.4) ##### :eyeglasses: Spec Compliance - `babel-parser` - [#​10491](https://togithub.com/babel/babel/pull/10491) Trailing comma after rest - The final fix ([@​nicolo-ribaudo](https://togithub.com/nicolo-ribaudo)) ##### :bug: Bug Fix - `babel-cli`, `babel-core`, `babel-generator`, `babel-helper-transform-fixture-test-runner` - [#​10536](https://togithub.com/babel/babel/pull/10536) Revert "chore: Upgrade source-map to 0.6.1 ([#​10446](https://togithub.com/babel/babel/issues/10446))" ([@​nicolo-ribaudo](https://togithub.com/nicolo-ribaudo))

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