I think it might help to speed up review of PRs to the offical libs if there was a graphical preview of the PRs.
I’ve modified cpavlina’s script  which generates image for components, so that it could be used to generate images of changed components (added or modified) in the Travis check.
I think I can see how to adapt comparelibs.py  to call the schlib-render script, and output a png.
The question is, is there a server accessible to Travis which could be used to store the images? Then we automatically add the image to pull requests.
The OpenSCAD project does a similar thing, they even compare the images to verify code changes have not broken anything and produce an HTML report. Example