Relax Mapnik peerDependency
Relax Mapnik peerDependency

Allows it to match future versions that also support MVT v2.

kartotherian/kartotherian,nyurik/kartotherian,kartotherian/kartotherian,nyurik/kartotherian,kartotherian/kartotherian,kartotherian/kartotherian,nyurik/kartotherian,nyurik/kartotherian