constructor(opts={}) {
    opts.overrideRender = true;
    super(opts);
    this.inputValue = '';
    this.clear = clear('', this.out.columns);
    this.filteredOptions = this.value;
    this.render();
  }
MultiselectPrompt Base Element
@param {Object} opts Options
@param {String} opts.message Message
@param {Array} opts.choices Array of choice objects
@param {String} [opts.hint] Hint to display
@param {String} [opts.warn] Hint shown for disabled choices
@param {Number} [opts.max] Max choices
@param {Number} [opts.cursor=0] Cursor start position
@param {Stream} [opts.stdin] The Readable stream to listen to
@param {Stream} [opts.stdout] The Writable stream to write readline data to