Update dependency gulp to ^4.0.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
gulp	devDependencies	patch	^4.0.1	homepage, source

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Release Notes

gulpjs/gulp

v4.0.1

Compare Source

Fix

• Temporary workaround for 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)
• Remove temporary workaround for facebook/Docusaurus#​257 (5c07954) - Closes facebook/Docusaurus#​257
• Added code ticks to "null" where missing (cb67319) - Closes #​2243
• Fix broken link in lastRun (d35653e)
• Add front-matter to documentation-missing page (a553cfd)
• Improve grammar on Concepts (01cfcc5) - Closes #​2247
• Remove spaces around
  (c960c1d)
• Improve grammar in src (eb493a2) - Closes #​2248
• Fix formatting error (ca6ba35) - Closes #​2250
• Fix formatting of lastRun (8569f85) - Closes #​2251
• Add missing link in watch (e35bdac) - Closes #​2252
• Fix broken link in tasks (6d43750) - Closes #​2253
• Improve punctuation in tree (8e9fd70) - Closes #​2254
• Fix mistake in "Splitting a gulpfile" (96c353d) - Closes #​2255
• Remove front-matter from outdated pages (c5af6f1)
• Fix broken link in Table of Contents (c641369) - Closes #​2260
• Update the babel dependencies to install & configuration needed (7239cf1) - Closes #​2136
• Add "What's new in 4.0" section (75ea634) - Closes #​2089 #​2267
• Cleanup README for "latest" bump (24e202b) - Closes #​2268
• Revert "next" reference now that 4.0 is latest (ed27cbe)
• Add Azure Pipelines badge (f3f0548) - Closes #​2310
• Add note about transpilation to "Splitting a Gulpfile" section (53b9037) - Closes #​2311 #​2312
• Improve wording of file rename (88437f2) - Closes #​2314

Upgrade

• Update glob-watcher, gulp-cli, and undertaker dependencies & rimraf devDep (d3734d3)

Build

• Add node 10 to CI matrices (a5eac1c)
• Remove jscs & update eslint for code formatting rules (ad8a2f7)
• Fix Azure comment (34a6d53) - Closes #​2307
• Add Azure Pipelines CI (b2c6c7e) - Closes #​2299

Scaffold

• Mark _.png and _.jpg as binary files to git (a010db6)
• Update some links and license year (1027236)
• Add tidelift configuration (49b5aca)
• Add new expense policy (9819957)
• Add support-bot template (9078c49)

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