Convert attributes [Stirng: Any] to Swift 4 attributes [NSAttributedStringKey: Any]

gistfile1.txt

public extension Dictionary {
    func toNSAttributedStringKeys() -> [NSAttributedStringKey: Any] {
        var atts = [NSAttributedStringKey: Any]()

        for key in keys {
            if let keyString = key as? String {
                atts[NSAttributedStringKey(keyString)] = self[key]
            }
        }

        return atts
    }
}