[BUG] getflag options

```bash
➜  ~ htb-cli getflag --help
Retrieves and submits flags from an SSH connection (linux only)

Usage:
  htb-cli getflag [flags]

Flags:
  -h, --help              help for getflag
      --host string       (Optional) SSH host
  -p, --password string   SSH password
  -P, --port int          (Optional) SSH Port (Default 22) (default 22)
  -u, --username string   SSH username
```