404 for favicon on recent docs

[Nemo157]

e.g. https://docs.rs/chrono/0.4.18/chrono/

Since nightly-2020-09-26 it appears that rustdoc is using a .svg favicon, which isn't being stored as part of the essential files.

[icp1994]

Is the change not live yet? The chrono favicon still doesn't load for me.

[jyn514]

@icp1994 that's #464. I'll see if I can rebuild chrono manually sometime today.