module.exports = {
  options: {
    map: {
      inline: false,
    },

    processors: [
      require('pixrem')(), // add fallbacks for rem units

      require('autoprefixer')({
        // add vendor prefixes
        browsers: [
          'last 3 version',
          'ie 8',
          'ff 3.6',
          'opera 11.1',
          'ios 4',
          'android 2.3',
        ],
      }),

      require('cssnano')({
        convertValues: false,
        zindex: false,
      }), // minify the result
    ],
  },

  main: {
    files: {
      '<%= destMinCSS %>' : '<%= destCSS %>',
    },
  },
};

@@ -271,53 +271,13 @@
 'ie 
-8',%0A          'ff 3.6',%0A          'opera 11.1
+%3E= 10
 ',%0A 
@@ -291,10 +291,10 @@
   'i
-os
+OS
  4',
@@ -305,17 +305,17 @@
        '
-a
+A
 ndroid 2

Update autoprefixer config