Update gulp requirement from ^3.9.0 to ^4.0.2 in /js

[dependabot-preview]

Updates the requirements on gulp to permit the latest version.

Release notes

Sourced from gulp's releases.

v4.0.2

Fix

• Bind src/dest/symlink to the gulp instance to support esm exports (5667666) - Ref standard-things/esm#797

Docs

• Add notes about esm support (4091bd3) - Closes #2278
• Fix the Negative Globs section & examples (3c66d95) - Closes #2297
• Remove next tag from recipes (1693a11) - Closes #2277
• Add default task wrappers to Watching Files examples to make runnable (d916276) - Closes #2322
• Fix syntax error in lastRun API docs (ea52a92) - Closes #2315
• Fix typo in Explaining Globs (5d81f42) - Closes #2326

Build

• Add node 12 to Travis & Azure (b4b5a68)

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

• 069350a Release: 4.0.2
• b4b5a68 Build: Add node 12 to Travis & Azure
• 5667666 Fix: Bind src/dest/symlink to the gulp instance to support esm exports (ref s...
• 4091bd3 Docs: Add notes about esm support (closes #2278)
• 3c66d95 Docs: Fix the Negative Globs section & examples (closes #2297)
• 1693a11 Docs: Remove next tag from recipes (closes #2277)
• d916276 Docs: Add default task wrappers to Watching Files examples to make runnable (...
• ea52a92 Docs: Fix syntax error in lastRun API docs (closes #2315)
• 5d81f42 Docs: Fix typo in Explaining Globs (#2326)
• ea3bba4 Release: 4.0.1
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #311 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #311   +/-   ##
=========================================
  Coverage     66.79%   66.79%           
  Complexity       61       61           
=========================================
  Files             9        9           
  Lines           268      268           
=========================================
  Hits            179      179           
  Misses           89       89

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[phil-davis]

see #400

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.