Remove unused command to add Tilezen PPA. The new CircleCI images are based off Debian rather than Ubuntu, which means this doesn't work as-is. However, the latest release of osm2pgsql in Debian seems to work OK, so perhaps the PPA isn't required.
Remove unused command to add Tilezen PPA. The new CircleCI images are based off Debian rather than Ubuntu, which means this doesn't work as-is. However, the latest release of osm2pgsql in Debian seems to work OK, so perhaps the PPA isn't required.

mapzen/vector-datasource,mapzen/vector-datasource,mapzen/vector-datasource