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Co-authored-by: Mislav Marohnić <mislav@github.com>
1. The `--json` export now only renders the `login` field for User types
and `name` and `slug` fields for Team types.
2. The `pr view` command now renders team reviewers in the format of
`ORG/SLUG` instead of the team name. This is so that the same value
can be used in the `pr create -r` flag.
The `--json` flag accepts a list of GraphQL fields to query for and
output in JSON format. To get the list of available flags, run the
command with a blank value for `--json`. Additional `--jq` and
`--template` flags are available just like in `gh api`.
