code example in readme.md does not work

[bukinoshita]

Both code does not work since send does not exist. It's pretty simple to solve that, but I do believe it would be better to have a code that actually works in the readme

const cors = require('micro-cors')()
const handler = (req, res) => send(res, 200, 'ok!')

module.exports = cors(handler)

const microCors = require('micro-cors')
const cors = microCors({ allowMethods: ['PUT', 'POST'] })
const handler = (req, res) => send(res, 200, 'ok!')

module.exports = cors(handler)

[bukinoshita]

#44