A new motion command does not support option -v

The option is missed for motion command. Replaced it with `--version`

```bash
$ motion -v
[!] Unknown arguments: -v
```
Merge pull request #29 from miry/patch-2

A new motion command does not support option -v
Merge branch 'refs/heads/HipByte/master' into japanese
Merge branch 'japanese' into gh-pages
generate the HTML document