[Snyk] Security upgrade gulp from 3.9.1 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Prototype Pollution SNYK-JS-MINIMIST-559764	Yes	Proof of Concept

Commit messages

Package name: gulp

The new version differs by 134 commits.

• 55eb23a Release: 4.0.0
• 173a532 Docs: Fix the installation instructions
• ec54d09 Docs: Improve note about out-of-date docs
• 03b7c98 Docs: Update recipes to install gulp@next
• 2eba29e Docs: Remove run-sequence from recipes
• 76eb4d6 Docs: Add installation instructions & update badges
• fbc162f Docs: Remove references to gulp-util
• 3011cf9 Scaffold: Normalize repository
• f27be05 Update: Remove graceful-fs from test suite
• 361ab63 Upgrade: Update glob-watcher
• 064d100 Build: Avoid broken node 9
• 057df59 Release: 4.0.0-alpha.3
• c1ba80c Breaking: Upgrade major versions of glob-watcher, gulp-cli & vinyl-fs
• 89acc5c Docs: Improve ES2015 task exporting examples (#1999)
• 0ac9e04 Docs: Add "Project structure" section to CONTRIBUTING.md (#1859)
• 723cbc4 Docs: Fix syntax in recipe example (#1715)
• d420a6a Docs: Have gulp.lastRun take a function to avoid task registration (#1828)
• 29ece6f Upgrade: Update undertaker
• e931cb0 Docs: Fix changelog typos (#1696)
• 477db84 Docs: Add a "BrowserSync with Gulp 4" recipe (#1659)
• d4ed3c7 Docs: Add options.cwd for gulp.src API (#1645)
• 5dc3b07 Docs: Update gulp.watch API to align with glob-watcher
• 0c66069 Breaking: Replace chokidar as gulp.watch with glob-watcher wrapper
• c3dbc10 Docs: Clarify incremental builds example (#1609)

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