Converting nodeback library to Promises

suggest change

const Promise = require('bluebird'),
      fs = require('fs')

Promise.promisifyAll(fs)

// now you can use promise based methods on 'fs' with the Async suffix
fs.readFileAsync('file.txt').then(contents => {
  console.log(contents)
}).catch(err => {
  console.error('error reading', err)
})

Found a mistake? Have a question or improvement idea? Let me know.

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