Fix getExplanation() #17
Description
Right now, calling getExplanation() on xkcd 999 will return https://www.explainxkcd.com/999. This is ok for basic needs because the page redirects to the actual url, which is https://www.explainxkcd.com/wiki/index.php/999:_Cougars. However, this difference messes up a few small things, such as pop-up links when posted to discord. Can getExplanation be changed to return the accurate url?