bump minimum Node + NPM version

[jcfranco]

The engines field currently specifies Node 8 and NPM 5, both of which are no longer maintained. These should be updated to more modern LTS versions.

While upgrading would be a breaking change in some setups, it's standard practice to evolve engines requirements alongside LTS progression.

One way to support newer environments while maintaining backward compatibility could be to decouple the data source; allowing it to be either bundled or required dynamically. This would let older versions of the library continue using updated data, assuming the format remains compatible.