chore(deps): update dependency vinyl-fs to v4

[lfrancke]

This PR contains the following updates:

Package	Type	Update	Change
vinyl-fs	devDependencies	major	^3.0 -> ^4.0.0

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Release Notes

gulpjs/vinyl-fs (vinyl-fs)

v4.0.0

Compare Source

⚠ BREAKING CHANGES

• Prefer symlink property set on Vinyl object over its path (#​345)
• Avoid error and reflect filesystem stat if futimes not implemented (#​341)
• Consider the greater of ctime & mtime when comparing since option (#​340)
• Normalize repository, dropping node <10.13 support
• Switch stream implementation to streamx (#​333)
• Default to utf8 decoding and encoding. Add encoding option to change (#​287)

Features

• Consider the greater of ctime & mtime when comparing since option (#​340) (9f907ba)
• Convert Windows-style paths in src() to proper globs (910c8a5)
• Prefer symlink property set on Vinyl object over its path (#​345) (0ac27a2)
• Replace lazystream with streamx Composer (#​344) (a80dae3)
• Switch stream implementation to streamx (#​333) (910c8a5)
• Test against streams from core, streamx, and readable-stream (910c8a5)
• Default to utf8 decoding and encoding. Add encoding option to change (#​287)

Bug Fixes

• Add regression test for negative relative globs (#​343) (ebe6498)
• Avoid error and reflect filesystem stat if futimes not implemented (#​341) (9ba20fd)
• Correct regression with src using arrays of globs (#​342) (5659934)
• Reference correct property name in integration testing (#​320) (df245a4)
• Workaround symlink stat bug in Node 10 on Windows (910c8a5)

Miscellaneous Chores

• Normalize repository, dropping node <10.13 support (910c8a5)

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