chore(deps): update dependency fs-extra to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
fs-extra	devDependencies	major	^7.0.1 -> ^8.0.0	source

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Release Notes

jprichardson/node-fs-extra

### [`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 depreciated, 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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