Add alternative method for running prod to the readme

mountainbug95

28.43.2020 f32ec234cf0830e37fb9ec355ca4e988fd08683f

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module.exports = {
  plugins: {
   'postcss-import': {},
   'postcss-cssnext': {
       browsers: ['last 2 versions', '> 5%'],
      }
    }  
};