Update dependency fs-extra to v8 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
fs-extra	devDependencies	major	7.0.1 -> 8.1.0

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Release Notes

jprichardson/node-fs-extra

### [`v8.1.0`](https://togithub.com/jprichardson/node-fs-extra/blob/master/CHANGELOG.md#​810--2019-06-28) [Compare Source](https://togithub.com/jprichardson/node-fs-extra/compare/32a65ffd9111829dbba15d79f1d27519c7dc96a6...8.1.0) - Add support for promisified `fs.realpath.native` in Node v9.2+ ([#​650](https://togithub.com/jprichardson/node-fs-extra/issues/650), [#​682](https://togithub.com/jprichardson/node-fs-extra/pull/682)) - Update `graceful-fs` dependency ([#​700](https://togithub.com/jprichardson/node-fs-extra/pull/700)) - Use `graceful-fs` everywhere ([#​700](https://togithub.com/jprichardson/node-fs-extra/pull/700)) ### [`v8.0.1`](https://togithub.com/jprichardson/node-fs-extra/blob/master/CHANGELOG.md#​801--2019-05-13) [Compare Source](https://togithub.com/jprichardson/node-fs-extra/compare/8.0.0...32a65ffd9111829dbba15d79f1d27519c7dc96a6) - Fix bug `Maximum call stack size exceeded` error in `util/stat` ([#​679](https://togithub.com/jprichardson/node-fs-extra/pull/679)) ### [`v8.0.0`](https://togithub.com/jprichardson/node-fs-extra/blob/master/CHANGELOG.md#​800--2019-05-11) [Compare Source](https://togithub.com/jprichardson/node-fs-extra/compare/7.0.1...8.0.0) **NOTE:** Node.js v6 support is deprecated, and will be dropped in the next major release. - Use `renameSync()` under the hood in `moveSync()` - Fix bug with bind-mounted directories in `copy*()` ([#​613](https://togithub.com/jprichardson/node-fs-extra/issues/613), [#​618](https://togithub.com/jprichardson/node-fs-extra/pull/618)) - Fix bug in `move()` with case-insensitive file systems - Use `fs.stat()`'s `bigint` option in `copy*()` & `move*()` where possible ([#​657](https://togithub.com/jprichardson/node-fs-extra/issues/657))

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