Publishing to crates.io requires a description and a license; the
repository and readme give the crates.io page the right links. The
license texts ship as LICENSE-MIT and LICENSE-GPL.
Dual licensing is valid while no lintian-derived code is in tree:
shelling out to lintian is mere aggregation. When derived lint
collections are implemented they must land in a separate GPL-2-only
crate, since their copyright belongs to lintian's authors and
cannot carry an MIT grant; the core crate stays dual.
