readme: compare pending changes against google's branch
Skia Submodule Status: chrome/m80 ([pending changes][skiapending], [our changes][skiaours]).
-[skiapending]: https://github.com/rust-skia/skia/compare/m80-0.26.8...chrome/m80
+[skiapending]: https://github.com/rust-skia/skia/compare/m80-0.26.8...google:chrome/m80
[skiaours]: https://github.com/google/skia/compare/chrome/m80...rust-skia:m80-0.26.8
## Goals
