Problem: Script doesn't exit when using RedisUrList.

Step to replicate:
Run the following code:

'use strict';const supercrawler = require('supercrawler');const crawler = new supercrawler.Crawler({    urlList: new supercrawler.RedisUrlList({        redis: {            host: 'redis-server.example.org'        }    })});console.log('Script should exit after this.');

Expected behavior:
Script should stop after running.

Actual behavior:
Script runs indefinitely.

Workaround:
Callprocess.exit() to terminate the script.

BTW, I'm using AWS ElastiCache for Redis, just in case this detail is needed. :)