Update fs-extra requirement from ~8.0.0 to ~8.1.0

[dependabot-preview]

Updates the requirements on fs-extra to permit the latest version.

Changelog

Sourced from fs-extra's changelog.

8.1.0 / 2019-06-28

• Add support for promisified fs.realpath.native in Node v9.2+ (#650, #682)
• Update graceful-fs dependency (#700)
• Use graceful-fs everywhere (#700)

8.0.1 / 2019-05-13

• Fix bug Maximum call stack size exceeded error in util/stat (#679)

8.0.0 / 2019-05-11

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, #618)
• Fix bug in move() with case-insensitive file systems
• Use fs.stat()'s bigint option in copy*() & move*() where possible (#657)

7.0.1 / 2018-11-07

• Fix removeSync() on Windows, in some cases, it would error out with ENOTEMPTY (#646)
• Document mode option for ensureDir*() (#587)
• Don't include documentation files in npm package tarball (#642, #643)

7.0.0 / 2018-07-16

• BREAKING: Refine copy*() handling of symlinks to properly detect symlinks that point to the same file. (#582)
• Fix bug with copying write-protected directories (#600)
• Universalify fs.lchmod() (#596)
• Add engines field to package.json (#580)

6.0.1 / 2018-05-09

• Fix fs.promises ExperimentalWarning on Node v10.1.0 (#578)

6.0.0 / 2018-05-01

• Drop support for Node.js versions 4, 5, & 7 (#564)
• Rewrite move to use fs.rename where possible (#549)
• Don't convert relative paths to absolute paths for filter (#554)
• copy*'s behavior when preserveTimestamps is false has been OS-dependent since 5.0.0, but that's now explicitly noted in the docs (#563)
• Fix subdirectory detection for copy* & move* (#541)

... (truncated)

Commits

• b7df7cc 8.1.0
• 40c3d68 Use graceful-fs everywhere (#700)
• 9f1c029 Travis config tweaks (#693)
• 713c606 Add package-lock.json to .gitignore (#691)
• 31e177a Clarify docs for remove*() (#690)
• fff04cb Use files array in package.json instead of .npmignore (#692)
• 7a8424e Update CI configs to test new Node versions (#683)
• f3a2eed Upgrade to standard v12 (#685)
• fa661f3 Add support for fs.realpath.native in envs that support it (#682)
• 32a65ff 8.0.1
• Additional commits viewable in compare view

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