Update dependency gulp-sass to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gulp-sass	devDependencies	major	3.1.0 -> 4.0.2

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Release Notes

dlmanning/gulp-sass

v4.0.2

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Documentation

• Document how to use Dart Sass (@​nex3, #​672)

v4.0.1

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Fixes

• logError causing an error (@​DKvistgaard, #​681)

v4.0.0

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This release is remove our dependency on the deprecated gulp-util package. To do so we need to drop support for Node < 4.

We took this opportunity to update our support policy to match the upcoming Node Sass 5 release. From now on Gulp Sass will only support Active LTS and Current Node versions.

At the time of release this means Node ^6.9 || ^8.9 || ^9 || ^10.

Breaking changes

• Drop support for non-Active LTS and Current releases

Misc

• Replace deprecated gulp-utils (@​demurgos)
• Update dependencies (@​demurgos)

v3.2.1

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Features

• Bump minimum node-sass to 4.8.3 (@​xzyfer)

v3.2.0

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March 11, 2018

https://github.com/dlmanning/gulp-sass/releases/tag/v3.2.0

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