title: Gulp: How to change modification time of file
body: <p>I have gulp task below and with every run of this task (before browsersync) I want to change last modification time of one file (nothing changes in that file, I just need to change time of last modification - alternative to shell "touch" command). Can somebody tell me what's the easiest way to do that please? Thanks!</p>
  
  <pre><code>gulp.task('sass', function() {
  
      return sass(pkg.sass.dir, {sourcemap: true, precision: 10}) 
          .on('error', function (err) { 
              onError(err);
          })
          .pipe(autoprefixer({
              browsers: ['last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'],
              cascade: true
          }))
          .pipe(gulp.dest(pkg.css.dir))
          .pipe(browsersync.reload({stream:true}));
  });
  </code></pre>