chore(deps): update dependency @babel/preset-env to v7.4.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
@​babel/preset-env	devDependencies	patch	7.4.1 -> 7.4.2	homepage, source

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Release Notes

babel/babel

### [`v7.4.2`](https://togithub.com/babel/babel/blob/master/CHANGELOG.md#v742-2019-03-21) [Compare Source](https://togithub.com/babel/babel/compare/v7.4.1...v7.4.2) ##### :bug: Bug Fix - `babel-parser` - [#​9725](https://togithub.com/babel/babel/pull/9725) Modules might be in loose mode when checking for undecl exports ([@​nicolo-ribaudo](https://togithub.com/nicolo-ribaudo)) - [#​9719](https://togithub.com/babel/babel/pull/9719) Fix scope checks with enabled flow plugin ([@​danez](https://togithub.com/danez)) - `babel-helpers`, `babel-plugin-transform-named-capturing-groups-regex` - [#​9726](https://togithub.com/babel/babel/pull/9726) Fix typo in wrapRegExp helper ([@​nicolo-ribaudo](https://togithub.com/nicolo-ribaudo)) - `babel-preset-env` - [#​9724](https://togithub.com/babel/babel/pull/9724) Closes [#​9713](https://togithub.com/babel/babel/issues/9713) ([@​zloirock](https://togithub.com/zloirock)) ##### :nail_care: Polish - `babel-preset-env` - [#​9732](https://togithub.com/babel/babel/pull/9732) Mark the core-js warning as such ([@​nicolo-ribaudo](https://togithub.com/nicolo-ribaudo)) - [#​9716](https://togithub.com/babel/babel/pull/9716) Tweak preset-env corejs/useBuiltIns warning and error messages ([@​existentialism](https://togithub.com/existentialism)) ##### :house: Internal - [#​9718](https://togithub.com/babel/babel/pull/9718) Bump Babel deps ([@​existentialism](https://togithub.com/existentialism))

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