Extend the gulp-autoprefixer Options type (#37671)
Extend the gulp-autoprefixer Options type (#37671)

* Extend the gulp-autoprefixer Options type

* Fix TypeScript version

mcliment/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped