Greetings,

I am using the theme rrt and I love it! But I've noticed that it does not syntax highlight .diff files at all.

Take this sample:

- foo
+ bar

And try it on https://swapoff.org/chroma/playground/.

It works perfectly with the monokai style, while rrt does not provide any highlighting. However other styles seem to be affected, too.

Thanks in advance, I hope it can be resolved. I did not seem to have any issues with rrt with other file formats and I do love the theme! :)