Switching to PNG format (Patreon)

I read somewhere that saving as JPG, even as the highest quality JPG, results in some artifact-ation and loss of detail and color, so starting with page 51, I'm going to be switching over to PNG... also saving the images in a slightly higher resolution going forward.

Perhaps one day, that'll make a larger difference for my higher quality scenes, but I'd rather make the change now when it matters less, than make it in the future when the difference will be more jarring for some people.

Let me know if this causes any issues with viewing new pages and art!