Backup script still doesn't save highest resolution image#222

- Using the latest version of tumblr-utils. (Just downloaded it yesterday) - The exact command you ran: `python tumblr_backup.py -t "snape,severus snape,albus dumbledore,dumbledore" girilimoni` The problem with urls needing to be replaced with `*_1280` at the end, seems to have been fixed in #80 However, there exists another kind of image url (probably newly implemented by tumblr). ### An example from this post: https://girilimoni.tumblr.com/post/618689233552637952/and-so-i-fulfilled-my-dream-of-making-comics Here's the first image of the post: https://64.media.tumblr.com/3e10d6fa224ee770245e4fb965283860/3ed90c7f16a53a25-3e/s1280x1920/57d180028186c2bd6fd73733e1123828753f6525.jpg tumblr_backup.py successfully downloads this image. However, if you change the url to some ridiculously high number, you can get a higher resolution image. 64.media.tumblr.com/3e10d6fa224ee770245e4fb965283860/3ed90c7f16a53a25-3e/**s1280x1920**/57d180028186c2bd6fd73733e1123828753f6525.jpg 64.media.tumblr.com/3e10d6fa224ee770245e4fb965283860/3ed90c7f16a53a25-3e/**s999999999x999999999**/57d180028186c2bd6fd73733e1123828753f6525.jpg The `s1280x1920` url downloads an image of 1280x784 in dimension. The `s999999999x999999999` url downloads an image of 2874x1761 in dimension. The number can be changed to whatever, but I've found that the higher it is, the better. It will only download in the highest available resolution if the dimensions of the url are >= to the image's highest available resolution. Every other image in the command I used has the same url issue. I've seen this new url type on other blogs too. A fix would be appreciated!