function img() {
    return gulp.src(paths.images.src, {
        encoding: false
    })
    .pipe(imagemin())
    .pipe(gulp.dest(paths.images.dest));
}

gulp.task('pug', function(){
    return gulp.src("app/pug/**/*.pug")
        .pipe(plumber())
        .pipe(pug({
            pretty: true
         }))
        .pipe(prettyHtml({
            indent_size: 4
        }))
        .pipe(gulp.dest("app/"))
        .pipe(browserSync.reload({stream: true}));
});