use optimist@0.6.0
use optimist@0.6.0

paulovieira/tilelive,mapbox/tilelive,topwood/tilelive,tomhughes/tilelive.js,gravitystorm/tilelive.js,Norkart/tilelive.js,kyroskoh/tilelive,mapbox/tilelive.js,nyurik/tilelive.js