title: openmaptiles - vector files at lower than zoom level 14
body: <p>Is it possible to generate the source vector files at a resolution lower than zoom level 14?
  I know you can overzoom, but that doesn't improve the map resolution, it just lets you get closer to the content resolution at ZL14
  So, can OpenMapTiles generate vectors for us to create tiles from that goes down to, say, ZL17?</p>