old_contents: var blake2b = require('./index.js')
  
  var output = new Uint8Array(64)
  var input = Buffer.from('hello world')
  
  blake2b(out, input)
  
new_contents: var blake2b = require('./index.js')
  
  var output = new Uint8Array(64)
  var input = Buffer.from('hello world')
  
  blake2b(output, input)
  
  console.log(output)
  
subject: Fix example