Updating README / no EPDOptimize required anymore

Changed

• No integration update, but updating README file to reflect update of paperlesspaper API service. As of ~20. April 2026, paperlesspaper changed their uploadSingleImage API call so that it includes their new, optimized version of EPDOptimize. Therefore, you do not need to pre-dither the images anymore, only resize them and save as PNG. Pre-dithering / pre-optimizing using EPDOptimize leads to wrong colors. In case you use the optimization script (https://github.com/fwmone/eink-optimize) to pre-dither images, please disable EPDOptimize and re-render all your images. I provide further explanation in the optimization script's README.