Add a scalastyle linter with a configuration pointing to the scalastyle files and break a scalastyle rule.
Example configuration:
```lang=json, name=.arclint
{
"linters": {
"scalastyle": {
"type": "scalastyle",
"scalastyle.config": "support/scalastyle/scalastyle-config.xml",
"scalastyle.jar": "support/scalastyle/scalastyle_2.11-0.6.0-batch.jar",
"include": "(\\.scala$)"
}
}
}
```