Transitive dependency not compileable with nightly-2021-12-04

[28Smiles]

The crate tracing_subsriber uses thread_local, which in its latest version is not compileable with nightly-2021-12-04, since it now uses language features newer than nightly-2021-12-04. Downgrading with cargo update -p thread_local --precise 1.1.4 worked for me.
Maybe add this as a disclaimer to the doc.

[apriori]

You might give #98 a try.

It seems, as of late this project is effectively unmaintained.

[28Smiles]

I could, but with the downgrade it also works for now.