old_contents: module.exports = {
    plugins: {
      'autoprefixer': {},
    }
  }
  
new_contents: module.exports = {
    plugins: {
      autoprefixer: {
        browsers: [
          '>1%',
          'last 4 versions',
          'Firefox ESR',
          'not ie < 9', // React doesn't support IE8 anyway
        ]
      },
    }
  }
  
subject: Add diff browser support for autoprefixer