title: How do I target IE9 and above with grunt autoprefixer?
body: <p>How do I target IE9 and above with grunt autoprefixer? Can I do something like the following:</p>
  
  <pre><code>  grunt.config('autoprefixer', {
      options: {
        browsers: ['IE9+']
      },
      dist: {
        expand: true,
        src: '/styles/app.css'
      }
    });
  </code></pre>