Add alternative method for running prod to the readme (#273)

Tanner Smith

28.55.2020 6500b99ba6a03b28f9789f50efde2f0975df914a

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