What's the preferred linux package name for OSM Express?

Cool project! I'm considering to package OSM Express for [NixOS](https://nixos.org) / [nixpkgs](https://github.com/NixOS/nixpkgs).

Package names in nixpkgs:
- must be lowercase
- cannot contain spaces
- may be hyphenated

(See section [Package naming](https://nixos.org/nixpkgs/manual/#sec-package-naming) in the Nixpkgs manual.)

Given these constraints, what should the package name be?

- `osmexpress`?
- `osm-express`?
- `osmx`, like your PyPI package for the python lib?