Provide an `of_articletype_or` scope for Goldencobra::Article

[5minpause]

There is this scope: https://github.com/ikuseiGmbH/Goldencobra/blob/master/app/models/goldencobra/article.rb#L126

scope :articletype, lambda{ |name| where(article_type: name)}

We need a second scope, that uses OR for scoping.

[marcometz]

use case would be something like this? Goldencobra::Article.articletype(["Report Index", "Event Show"], any: true)

[5minpause]

Yes, something like this. Do you want to create a Pull Request for this? 😄