message: docs for constructor options
diff: @@ -32,9 +32,9 @@ blake2b.ready(function (err) {
  ## API
  -#### `var hash = blake2b()`
  +#### `var hash = blake2b([digestLength], [key], [salt], [personal])`
  -Create a new hash instance
  +Create a new hash instance. `digestLength` defaults to `32`.
  #### `hash.update(data)`
  