Auto merge of #179 - sotayamashita:patch-1, r=azu
Auto merge of #179 - sotayamashita:patch-1, r=azu

Fix typo

I got an error with `--ruledir` and I got a message below:

```
Invalid option '--ruledir' - perhaps you meant '--rulesdir'?
```

1000ch/textlint,t-ashula/textlint,textlint/textlint,1000ch/textlint,1000ch/textlint,textlint/textlint,textlint/textlint,textlint/textlint