the compatability option is not working

[rodude123]

I tried this, and it does not want to change make it compatible with ie8 or any ie version. I checked the minified version of the code.

gulp.task("minifyCSS", () =>
{
	return gulp.src("src/css/main.css")
		.pipe(cleanCSS({compatibility: "ie8"}))
		.pipe(gulp.dest("dist/css"));
});