How to use the rita.RiMarkov function in rita

.on('end', () => {
      const markov = new rita.RiMarkov(20)
      markov.loadText(inputText)
      const sentence = markov.generateSentences(1)
        .toString()
        .substring(0, 140)
      bot.post('statuses/update', {
        status: sentence
      }, (err, data, response) => {
        if (err) {
          console.log(err)
        } else {
          console.log('Markov status tweeted!', sentence)
        }
      })
    })
}