Update fs-extra to version 0.28.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

fs-extra just published its new version 0.28.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of fs-extra – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 40 commits .

• ef35b70 0.28.0
• 8c56e5b (Closes #209, Closes #237) lib/mkdirs: if invalid path char, return callback OR throw err
• a0cb04b (Closes #93) libs/mkdirs: prevent stack overflow if drive is not mounted in Windows
• 76dcfa9 lib/mkdirs/tests/root: skip if network drive
• f5c64d5 gitignore: add npm debug
• 5747fb3 (Closes #192) removed createOutputStream()
• 2a5e355 readme: update note about hacking on fs-extra
• 5652b96 changelog: update issue links (auto generated)
• e2a7dae appveyor: node v5
• e8d2949 package: update travis
• a524434 readme: fix date of note
• e21cc16 readme: note about dropping old Node.js
• ad98995 readme: update
• 6fb9fc7 0.27.0
• a305847 Merge pull request #235 from rjz/master

There are 40 commits in total. See the full diff.

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