chore(package): update xo to version 0.19.0 (#404)
chore(package): update xo to version 0.19.0 (#404)

https://greenkeeper.io/
mike-engel/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,southpolesteve/now-cli,zeit/now-cli,southpolesteve/now-cli,zeit/now-cli,zeit/now-cli