This is a pretty weird method name, especially with `#filters` also being a method. Do people still use it? I say just leave it out if they don't. Otherwise, maybe we can combine them?

```ruby
def filters(options = {})
  if style = options.delete(:old_style)
    perform_request(api_function: "listfilters")
  else
    perform_request(api_function: "filterlist", options)
  end
end