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}))
});