Update: unfortunately I broke things with a code push yesterday, but it's working now and has unvote support. Additionally (and I think this is really cool), it exports the posts it votes on to a file and has a currationReport() function that will show you how much the bot is earning in terms of curation rewards (Steem Power):

➜  Bots git:(master) ✗ php CopyCatVoterTestCurationReport.php
0.039,kazumba/modern-day-edgar-cayce-nostradamus
0.233,webosfritos/thoughts-on-steemit-power-distribution-and-steempower-an-anthropology-based-approach
0.236,naquoya/sometimes-we-just-need-to-rage-against-the-machine
0.037,dorit-israeli/experimental-learning-space-education-by-dr-dorit-israeli
0.037,tonypeacock/join-a-niche-online-community-here-s-10-reasons-why
0.179,jaytaylor/on-international-dog-day-be-more-dog

So you can support a great initiative and get some love for your wallet as well. Double win!