webhook res: undefined

[luiguild]

I try use your awesome framework to build a simple test on heroku and I received this error on deploy:

webhook res: undefined

index.js

var bb = require('bot-brother')

var bot = module.exports = bb({
    key: process.env.TOKEN,
    webHook: {
        url: process.env.HEROKU_URL,
        port: 8443,
        https: false
    }
})

Have you any suggestion? Thank you!