[now-cli] Output `--json` to stdout for `now alias ls <url>` (#2922)
[now-cli] Output `--json` to stdout for `now alias ls <url>` (#2922)

Fixes #1337.
zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli