Gulp-sass: Drop dependency on deprecated `gulp-util`

[demurgos]

Hi,
gulp-util is deprecated. It should be replaced by dependencies on the individual components used by gulp-eslint. The README lists alternatives for the different components.

See https://github.com/gulpjs/gulp/issues/2065

[ladom]

gulpjs recommend using ansi-colors instead of chalk. I tried it on, it works good and passes all test.

[decksterr]

chalk could still be used w/o any much problem i guess, it's gutil.colors from gulp-util that's deprecated

[stefan-lehmann]

Can someone please release this, thanks!

[markushausammann]

Please release!!

[demurgos]

• Closed by https://github.com/dlmanning/gulp-sass/pull/667