Update gulp requirement from ^3.9.1 to ^4.0.1

[dependabot-preview]

Updates the requirements on gulp to permit the latest version.

Release notes

Sourced from gulp's releases.

v4.0.1

Fix

• Temporary workaround for Support reference style linking facebook/docusaurus#257 (9f4a2e9) - Closes facebook/Docusaurus#257

Docs

• Fix error in ES2015 usage example (a4e8d48) - Closes #2099 #2100
• Add temporary notice for 4.0.0 vs 3.9.1 documentation (126423a) - Closes #2121
• Improve recipe for empty glob array (45830cf) - Closes #2122
• Reword standard to default (b065a13)
• Fix recipe typo (86acdea) - Closes #2156
• Add front-matter to each file (d693e49) - Closes #2109
• Rename "Getting Started" to "Quick Start" & update it (6a0fa00)
• Add "Creating Tasks" documentation (21b6962)
• Add "JavaScript and Gulpfiles" documentation (31adf07)
• Add "Working with Files" documentation (50fafc6)
• Add "Async Completion" documentation (ad8b568)
• Add "Explaining Globs" documentation (f8cafa0)
• Add "Using Plugins" documentation (233c3f9)
• Add "Watching Files" documentation (f3f2d9f)
• Add Table of Contents to "Getting Started" directory (a43caf2)
• Improve & fix parts of Getting Started (84b0234)
• Create and link-to a "docs missing" page for LINK_NEEDED references (2bd75d0)
• Redirect users to new Getting Started guides (53e9727)
• Temporarily reference gulp@next in Quick Start (2cecf1e)
• Fixed a capitalization typo in a heading (3d051d8) - Closes #2242
• Use h2 headers within Quick Start documentation (921312c) - Closes #2241
• Fix for nested directories references (4c2b9a7)
• Add some more cleanup for Docusaurus (6a8fd8f)
• Temporarily point LINK_NEEDED references to documentation-missing.md (df7cdcb)
• API documentation improvements based on feedback (0a68710)
• Update API Table of Contents (d6dd438)
• Add API Concepts documentation (8dd3361)
• Add Vinyl.isCustomProp() documentation (40ee801)
• Add Vinyl.isVinyl() documentation (25a22bf)
• Add Vinyl documentation (fc09067)
• Update watch() documentation (69c22f0)
• Update tree() documentation (ebb9818)
• Update task() documentation (b636a9c)
• Update symlink() documentation (d580efa)
• Update src() documentation (d95b457)
• Update series() documentation (4169cb6)
• Update registry() documentation (d680487)
• Update parallel() documentation (dc3cba7)
• Update lastRun() documentation (363df21)
• Update dest() documentation (e447d81)
• Split API docs into separate markdown files (a3b8ce1)
• Fix hash link (af4bd51)
• Replace some links in Getting Started (c433c70)

... (truncated)

Changelog

Sourced from gulp's changelog.

gulp changelog

4.0.0

Task system changes

• replaced 3.x task system (orchestrator) with new task system (bach)
  • removed gulp.reset
  • removed 3 argument syntax for gulp.task
  • gulp.task should only be used when you will call the task with the CLI
  • added gulp.series and gulp.parallel methods for composing tasks. Everything must use these now.
  • added single argument syntax for gulp.task which allows a named function to be used as the name of the task and task function.
  • added gulp.tree method for retrieving the task tree. Pass { deep: true } for an archy compatible node list.
  • added gulp.registry for setting custom registries.

CLI changes

• split CLI out into a module if you want to save bandwidth/disk space. you can install the gulp CLI using either npm install gulp -g or npm install gulp-cli -g, where gulp-cli is the smaller one (no module code included)
• add --tasks-json flag to CLI to dump the whole tree out for other tools to consume
• added --verify flag to check the dependencies in package.json against the plugin blacklist.

vinyl/vinyl-fs changes

• added gulp.symlink which functions exactly like gulp.dest, but symlinks instead.
• added dirMode param to gulp.dest and gulp.symlink which allows better control over the mode of the destination folder that is created.
• globs passed to gulp.src will be evaluated in order, which means this is possible gulp.src(['*.js', '!b*.js', 'bad.js']) (exclude every JS file that starts with a b except bad.js)
• performance for gulp.src has improved massively
  • gulp.src(['**/*', '!b.js']) will no longer eat CPU since negations happen during walking now
• added since option to gulp.src which lets you only match files that have been modified since a certain date (for incremental builds)
• fixed gulp.src not following symlinks
• added overwrite option to gulp.dest which allows you to enable or disable overwriting of existing files

3.9.1

• update interpret to 1.0.0 (support for babel-register)
• fix to include manpages in published tarball
• documentation/recipe updates

3.9.0

• add babel support
• add transpiler fallback support
• add support for some renamed transpilers: livescript, etc
• add JSCS
• update dependencies (liftoff, interpret)
• documentation tweaks

3.8.11

• fix node 0.12/iojs problems

... (truncated)

Commits

• ea3bba4 Release: 4.0.1
• d3734d3 Upgrade: Update glob-watcher, gulp-cli, and undertaker dependencies & rimraf ...
• 88437f2 Docs: Improve wording of file rename (#2314)
• 53b9037 Docs: Add note about transpilation to "Splitting a Gulpfile" section (closes ...
• f3f0548 Docs: Add Azure Pipelines badge (#2310)
• 34a6d53 Build: Fix Azure comment (#2307)
• b2c6c7e Build: Add Azure Pipelines CI (#2299)
• ed27cbe Docs: Revert "next" reference now that 4.0 is latest
• 24e202b Docs: Cleanup README for "latest" bump (#2268)
• 75ea634 Docs: Add "What's new in 4.0" section (closes #2089) (#2267)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #18.