Add sourmash (Python + Rust extension, packaged with maturin) and missing pure-wheel deps (screed, bitstring, cachetools, deprecation).
After a couple of fixes in sourmash-bio/sourmash#2433 I managed to build it out-of-tree, would like to have it available here to make it easier to distribute (while PyPI doesn't support emscripten wheels).
Luiz Irber