Poor contrast in diff files highlighting

[sveggiani]

This is a great theme! My favorite so far. But it has an important issue. Contrast in Diff files is very poor.

If you can fix this it would be great! Thanks!

[mischah]

@sveggiani What is the file format? Is this a json file?

[sveggiani]

hi @mischah is a YAML .yml file: https://yaml.org/

Thanks!

[rac-augusto]

hi @mischah, I'm having this issue in PHP files as well...
It is somewhat hard to read:

Do you have any plans on updating it?

[rac-augusto]

@mischah, I've submitted a pull request with these colors.
I hope you like it :) Feel free to edit!