let sass = require('gulp-sass')
gulp.task( 'sass', function(){
    return  gulp.src('app/scss/style.sass')
                .pipe(sass({outputStyle: 'compressed',
                indentedSyntax: true}))
                .pipe(rename({suffix : '.min'}))
                .pipe(autoprefixer({overrideBrowserslist: ['last 8 versions']}))
                .pipe(gulp.dest('app/css'))
                .pipe(browserSync.reload({stream: true}))
});