Function dispatch 

pub fn dispatch(
    client: &Client,
    base_url: &str,
    auth: &Auth<'_>,
    op: &ApiOperation,
    matches: &ArgMatches,
) -> Result<Value, DispatchError>

Execute an API operation based on clap matches.

Convenience wrapper that chains PreparedRequest::from_operation + build_body + PreparedRequest::send + SendResponse::into_json.