missing {-v|--version} flag

New CLI missing this important flag:

```sh
# octopuscli
$ octo --version
  9.1.7
```

```sh
# octopus-cli
$ octopus --version
unknown flag: --version
```

Expectation from CLI users like me: _all CLIs_ support a `--help` and a `--version` flag, as the old client did 
