## getpass
  
  Get a password from the terminal. Sounds simple? Sounds like the `readline`
  module should be able to do it? NOPE.
  
  ## Install and use it
  
  ```bash
  npm install --save getpass
  ```
  
  ```javascript
  const mod_getpass = require('getpass');
  ```
  
  ## API
  
  ### `mod_getpass.getPass([options, ]callback)`
  
  Gets a password from the terminal. If available, this uses `/dev/tty` to avoid
  interfering with any data being piped in or out of stdio.
  
  This function prints a prompt (by default `Password:`) and then accepts input
  without echoing.
  
  Parameters:
  
   * `options`, an Object, with properties:
     * `prompt`, an optional String
   * `callback`, a `Func(error, password)`, with arguments:
     * `error`, either `null` (no error) or an `Error` instance
     * `password`, a String