code: function readlin(options, start, end) {
  
    return readline.createInterface({
      input: interfac(options, start, end),
      output: null,
      terminal: false,
    });
  }
docs: build readline interface
  
  @function readlin
  @param {Object} options - various options. Check README.md
  @param {Integer} start - starting bytes
  @param {Integer} [end] - ending bytes
  @return {Objetc}